diff --git a/public/js/src_modules/dropDownListAggregationAverage.mjs b/public/js/src_modules/dropDownListAggregationAverage.mjs
index 98098af9aceba331106b36842929758f225c9245..d2d6c322bb480ec54d318453c061ae098fce5832 100644
--- a/public/js/src_modules/dropDownListAggregationAverage.mjs
+++ b/public/js/src_modules/dropDownListAggregationAverage.mjs
@@ -13,21 +13,21 @@ import { extractPropertiesFromFormattedDatastreamMetadata } from "./fetchedDataP
  * Calculate the daily average of observations and format these aggregated observations
  *
  * @param {Array} uniqueCalendarDatesNestedArr An array made up of sub-array(s) of unique calendar date(s) string(s)
- * @param {Array} observationsAggregationNestedArr An array made up of sub-array(s) of aggregated observations
+ * @param {Array} observationsNestedArr An array made up of sub-array(s) of observations
  * @param {String} selectedSamplingRateAbbrev A string representing the abbreviated form of the selected sampling rate option
  * @param {Array} formattedMetadataNestedArr An array of sub-arrays of formatted metadata properties
  * @returns {Array} An array whose first element is the formatted aggregated (daily average) observations. The second element is an object made up of extracted & formatted datastream properties
  */
 const calculateAndFormatDailyAverageObservations = function (
   uniqueCalendarDatesNestedArr,
-  observationsAggregationNestedArr,
+  observationsNestedArr,
   selectedSamplingRateAbbrev,
   formattedMetadataNestedArr
 ) {
   // Calculate AVERAGE / DAILY of values of observations
   const observationsAverageDailyNestedArr =
     calculateAverageOfObservationValuesWithinInterval(
-      observationsAggregationNestedArr,
+      observationsNestedArr,
       selectedSamplingRateAbbrev,
       uniqueCalendarDatesNestedArr,
       "daily"
@@ -61,14 +61,14 @@ const calculateAndFormatDailyAverageObservations = function (
  * Calculate the monthly average of observations and format these aggregated observations
  *
  * @param {Array} uniqueCalendarDatesNestedArr An array made up of sub-array(s) of unique calendar date(s) string(s)
- * @param {Array} observationsAggregationNestedArr An array made up of sub-array(s) of aggregated observations
+ * @param {Array} observationsNestedArr An array made up of sub-array(s) of observations
  * @param {String} selectedSamplingRateAbbrev A string representing the abbreviated form of the selected sampling rate option
  * @param {Array} formattedMetadataNestedArr An array of sub-arrays of formatted metadata properties
  * @returns {Array} An array whose first element is the formatted aggregated (monthly average) observations. The second element is an object made up of extracted & formatted datastream properties
  */
 const calculateAndFormatMonthlyAverageObservations = function (
   uniqueCalendarDatesNestedArr,
-  observationsAggregationNestedArr,
+  observationsNestedArr,
   selectedSamplingRateAbbrev,
   formattedMetadataNestedArr
 ) {
@@ -81,7 +81,7 @@ const calculateAndFormatMonthlyAverageObservations = function (
   // Calculate AVERAGE / MONTHLY of values of observations
   const observationsAverageMonthlyNestedArr =
     calculateAverageOfObservationValuesWithinInterval(
-      observationsAggregationNestedArr,
+      observationsNestedArr,
       selectedSamplingRateAbbrev,
       uniqueCalendarMonthsNestedArr,
       "monthly"
diff --git a/public/js/src_modules/dropDownListAggregationMaximum.mjs b/public/js/src_modules/dropDownListAggregationMaximum.mjs
index 3ef25d3823eca6578d659ab99e4ef16763598241..bb5464d1c194befad044a659cf7af7e2d61dd177 100644
--- a/public/js/src_modules/dropDownListAggregationMaximum.mjs
+++ b/public/js/src_modules/dropDownListAggregationMaximum.mjs
@@ -13,21 +13,21 @@ import { extractPropertiesFromFormattedDatastreamMetadata } from "./fetchedDataP
  * Calculate the daily maximum of observations and format these aggregated observations
  *
  * @param {Array} uniqueCalendarDatesNestedArr An array made up of sub-array(s) of unique calendar date(s) string(s)
- * @param {Array} observationsAggregationNestedArr An array made up of sub-array(s) of aggregated observations
+ * @param {Array} observationsNestedArr An array made up of sub-array(s) of observations
  * @param {String} selectedSamplingRateAbbrev A string representing the abbreviated form of the selected sampling rate option
  * @param {Array} formattedMetadataNestedArr An array of sub-arrays of formatted metadata properties
  * @returns {Array} An array whose first element is the formatted aggregated (daily maximum) observations. The second element is an object made up of extracted & formatted datastream properties
  */
 const calculateAndFormatDailyMaximumObservations = function (
   uniqueCalendarDatesNestedArr,
-  observationsAggregationNestedArr,
+  observationsNestedArr,
   selectedSamplingRateAbbrev,
   formattedMetadataNestedArr
 ) {
   // Calculate MAXIMUM / DAILY of values of observations
   const observationsMaximumDailyNestedArr =
     calculateMaximumObservationValuesWithinInterval(
-      observationsAggregationNestedArr,
+      observationsNestedArr,
       selectedSamplingRateAbbrev,
       uniqueCalendarDatesNestedArr,
       "daily"
@@ -61,14 +61,14 @@ const calculateAndFormatDailyMaximumObservations = function (
  * Calculate the monthly maximum of observations and format these aggregated observations
  *
  * @param {Array} uniqueCalendarDatesNestedArr An array made up of sub-array(s) of unique calendar date(s) string(s)
- * @param {Array} observationsAggregationNestedArr An array made up of sub-array(s) of aggregated observations
+ * @param {Array} observationsNestedArr An array made up of sub-array(s) of observations
  * @param {String} selectedSamplingRateAbbrev A string representing the abbreviated form of the selected sampling rate option
  * @param {Array} formattedMetadataNestedArr An array of sub-arrays of formatted metadata properties
  * @returns {Array} An array whose first element is the formatted aggregated (monthly maximum) observations. The second element is an object made up of extracted & formatted datastream properties
  */
 const calculateAndFormatMonthlyMaximumObservations = function (
   uniqueCalendarDatesNestedArr,
-  observationsAggregationNestedArr,
+  observationsNestedArr,
   selectedSamplingRateAbbrev,
   formattedMetadataNestedArr
 ) {
@@ -81,7 +81,7 @@ const calculateAndFormatMonthlyMaximumObservations = function (
   // Calculate MAXIMUM / MONTHLY of values of observations
   const observationsMaximumMonthlyNestedArr =
     calculateMaximumObservationValuesWithinInterval(
-      observationsAggregationNestedArr,
+      observationsNestedArr,
       selectedSamplingRateAbbrev,
       uniqueCalendarMonthsNestedArr,
       "monthly"
diff --git a/public/js/src_modules/dropDownListAggregationMinimum.mjs b/public/js/src_modules/dropDownListAggregationMinimum.mjs
index 2fec44e30463a3006aba132d1f47531e3be42673..fa1d050557fc694801d78f61714feac4dad88cdb 100644
--- a/public/js/src_modules/dropDownListAggregationMinimum.mjs
+++ b/public/js/src_modules/dropDownListAggregationMinimum.mjs
@@ -13,21 +13,21 @@ import { extractPropertiesFromFormattedDatastreamMetadata } from "./fetchedDataP
  * Calculate the daily minimum of observations and format these aggregated observations
  *
  * @param {Array} uniqueCalendarDatesNestedArr An array made up of sub-array(s) of unique calendar date(s) string(s)
- * @param {Array} observationsAggregationNestedArr An array made up of sub-array(s) of aggregated observations
+ * @param {Array} observationsNestedArr An array made up of sub-array(s) of observations
  * @param {String} selectedSamplingRateAbbrev A string representing the abbreviated form of the selected sampling rate option
  * @param {Array} formattedMetadataNestedArr An array of sub-arrays of formatted metadata properties
  * @returns {Array} An array whose first element is the formatted aggregated (daily minimum) observations. The second element is an object made up of extracted & formatted datastream properties
  */
 const calculateAndFormatDailyMinimumObservations = function (
   uniqueCalendarDatesNestedArr,
-  observationsAggregationNestedArr,
+  observationsNestedArr,
   selectedSamplingRateAbbrev,
   formattedMetadataNestedArr
 ) {
   // Calculate MINIMUM / DAILY of values of observations
   const observationsMinimumDailyNestedArr =
     calculateMinimumObservationValuesWithinInterval(
-      observationsAggregationNestedArr,
+      observationsNestedArr,
       selectedSamplingRateAbbrev,
       uniqueCalendarDatesNestedArr,
       "daily"
@@ -61,14 +61,14 @@ const calculateAndFormatDailyMinimumObservations = function (
  * Calculate the monthly minimum of observations and format these aggregated observations
  *
  * @param {Array} uniqueCalendarDatesNestedArr An array made up of sub-array(s) of unique calendar date(s) string(s)
- * @param {Array} observationsAggregationNestedArr An array made up of sub-array(s) of aggregated observations
+ * @param {Array} observationsNestedArr An array made up of sub-array(s) of observations
  * @param {String} selectedSamplingRateAbbrev A string representing the abbreviated form of the selected sampling rate option
  * @param {Array} formattedMetadataNestedArr An array of sub-arrays of formatted metadata properties
  * @returns {Array} An array whose first element is the formatted aggregated (monthly minimum) observations. The second element is an object made up of extracted & formatted datastream properties
  */
 const calculateAndFormatMonthlyMinimumObservations = function (
   uniqueCalendarDatesNestedArr,
-  observationsAggregationNestedArr,
+  observationsNestedArr,
   selectedSamplingRateAbbrev,
   formattedMetadataNestedArr
 ) {
@@ -81,7 +81,7 @@ const calculateAndFormatMonthlyMinimumObservations = function (
   // Calculate MINIMUM / MONTHLY of values of observations
   const observationsMinimumMonthlyNestedArr =
     calculateMinimumObservationValuesWithinInterval(
-      observationsAggregationNestedArr,
+      observationsNestedArr,
       selectedSamplingRateAbbrev,
       uniqueCalendarMonthsNestedArr,
       "monthly"
diff --git a/public/js/src_modules/dropDownListAggregationSum.mjs b/public/js/src_modules/dropDownListAggregationSum.mjs
index 472db001db7d745a858b038935512b7d0fc84d53..4d153282d6f51989c4540fb5225a4e86311f3360 100644
--- a/public/js/src_modules/dropDownListAggregationSum.mjs
+++ b/public/js/src_modules/dropDownListAggregationSum.mjs
@@ -13,21 +13,21 @@ import { extractPropertiesFromFormattedDatastreamMetadata } from "./fetchedDataP
  * Calculate the daily sum of observations and format these aggregated observations
  *
  * @param {Array} uniqueCalendarDatesNestedArr An array made up of sub-array(s) of unique calendar date(s) string(s)
- * @param {Array} observationsAggregationNestedArr An array made up of sub-array(s) of aggregated observations
+ * @param {Array} observationsNestedArr An array made up of sub-array(s) of observations
  * @param {String} selectedSamplingRateAbbrev A string representing the abbreviated form of the selected sampling rate option
  * @param {Array} formattedMetadataNestedArr An array of sub-arrays of formatted metadata properties
  * @returns {Array} An array whose first element is the formatted aggregated (daily sum) observations. The second element is an object made up of extracted & formatted datastream properties
  */
 const calculateAndFormatDailySumObservations = function (
   uniqueCalendarDatesNestedArr,
-  observationsAggregationNestedArr,
+  observationsNestedArr,
   selectedSamplingRateAbbrev,
   formattedMetadataNestedArr
 ) {
   // Calculate SUM / DAILY of values of observations
   const observationsSumDailyNestedArr =
     calculateSumOfObservationValuesWithinInterval(
-      observationsAggregationNestedArr,
+      observationsNestedArr,
       selectedSamplingRateAbbrev,
       uniqueCalendarDatesNestedArr,
       "daily"
@@ -61,14 +61,14 @@ const calculateAndFormatDailySumObservations = function (
  * Calculate the monthly sum of observations and format these aggregated observations
  *
  * @param {Array} uniqueCalendarDatesNestedArr An array made up of sub-array(s) of unique calendar date(s) string(s)
- * @param {Array} observationsAggregationNestedArr An array made up of sub-array(s) of aggregated observations
+ * @param {Array} observationsNestedArr An array made up of sub-array(s) of observations
  * @param {String} selectedSamplingRateAbbrev A string representing the abbreviated form of the selected sampling rate option
  * @param {Array} formattedMetadataNestedArr An array of sub-arrays of formatted metadata properties
  * @returns {Array} An array whose first element is the formatted aggregated (monthly sum) observations. The second element is an object made up of extracted & formatted datastream properties
  */
 const calculateAndFormatMonthlySumObservations = function (
   uniqueCalendarDatesNestedArr,
-  observationsAggregationNestedArr,
+  observationsNestedArr,
   selectedSamplingRateAbbrev,
   formattedMetadataNestedArr
 ) {
@@ -81,7 +81,7 @@ const calculateAndFormatMonthlySumObservations = function (
   // Calculate SUM / MONTHLY of values of observations
   const observationsSumMonthlyNestedArr =
     calculateSumOfObservationValuesWithinInterval(
-      observationsAggregationNestedArr,
+      observationsNestedArr,
       selectedSamplingRateAbbrev,
       uniqueCalendarMonthsNestedArr,
       "monthly"
diff --git a/public/js/src_modules/dropDownListChartColumn.mjs b/public/js/src_modules/dropDownListChartColumn.mjs
index e412fdc55f5b1d9e5555785a90fc6f94e7c3ab0d..49af49cf5b236d4ce39b247dbf20cb89bb57e99a 100644
--- a/public/js/src_modules/dropDownListChartColumn.mjs
+++ b/public/js/src_modules/dropDownListChartColumn.mjs
@@ -27,31 +27,31 @@ import {
  *
  * @param {String} selectedAggregationType A string representing the selected aggregation type. The currently supported strings include `Sum`, `Maximum`, `Minimum` and `Average`
  * @param {String} selectedAggregationDuration A string representing the selected aggregation duration. The currently supported strings include `Daily` and `Monthly`
- * @param {Array} observationsAggregationNestedArr An array made up of sub-array(s) of aggregated observations
+ * @param {Array} observationsNestedArr An array made up of sub-array(s) of observations
  * @param {String} selectedSamplingRateAbbrev A string representing the abbreviated form of the selected sampling rate option
  * @param {Array} uniqueCalendarDatesNestedArr An array made up of sub-array(s) of unique calendar date(s) string(s)
  * @param {Array} formattedMetadataNestedArr An array of sub-arrays of formatted metadata properties
  * @returns {undefined} undefined
  */
 export const drawColumnChartBasedOnSelectedAggregationOptions = function (
-  selectedAggregationTypeArr,
+  selectedAggregationType,
   selectedAggregationDuration,
-  observationsAggregationNestedArr,
+  observationsNestedArr,
   selectedSamplingRateAbbrev,
   uniqueCalendarDatesNestedArr,
   formattedMetadataNestedArr
 ) {
+  // Daily / sum
   if (
-    selectedAggregationTypeArr === "Sum" &&
+    selectedAggregationType === "Sum" &&
     selectedAggregationDuration === "Daily"
   ) {
-    // Formatted observations and metadata for chart - daily / sum
     const [
       formattedObservationsSumDailyNestedArr,
       extractedFormattedDatastreamProperties,
     ] = calculateAndFormatDailySumObservations(
       uniqueCalendarDatesNestedArr,
-      observationsAggregationNestedArr,
+      observationsNestedArr,
       selectedSamplingRateAbbrev,
       formattedMetadataNestedArr
     );
@@ -60,17 +60,18 @@ export const drawColumnChartBasedOnSelectedAggregationOptions = function (
       formattedObservationsSumDailyNestedArr,
       extractedFormattedDatastreamProperties
     );
-  } else if (
-    selectedAggregationTypeArr === "Sum" &&
+  }
+  // Monthly / sum
+  else if (
+    selectedAggregationType === "Sum" &&
     selectedAggregationDuration === "Monthly"
   ) {
-    // Formatted observations and metadata for chart - monthly / sum
     const [
       formattedObservationsSumMonthlyNestedArr,
       extractedFormattedDatastreamProperties,
     ] = calculateAndFormatMonthlySumObservations(
       uniqueCalendarDatesNestedArr,
-      observationsAggregationNestedArr,
+      observationsNestedArr,
       selectedSamplingRateAbbrev,
       formattedMetadataNestedArr
     );
@@ -79,8 +80,10 @@ export const drawColumnChartBasedOnSelectedAggregationOptions = function (
       formattedObservationsSumMonthlyNestedArr,
       extractedFormattedDatastreamProperties
     );
-  } else if (
-    selectedAggregationTypeArr === "Maximum" &&
+  }
+  // Daily / maximum
+  else if (
+    selectedAggregationType === "Maximum" &&
     selectedAggregationDuration === "Daily"
   ) {
     // Formatted observations and metadata for chart - daily / maximum
@@ -89,7 +92,7 @@ export const drawColumnChartBasedOnSelectedAggregationOptions = function (
       extractedFormattedDatastreamProperties,
     ] = calculateAndFormatDailyMaximumObservations(
       uniqueCalendarDatesNestedArr,
-      observationsAggregationNestedArr,
+      observationsNestedArr,
       selectedSamplingRateAbbrev,
       formattedMetadataNestedArr
     );
@@ -98,17 +101,18 @@ export const drawColumnChartBasedOnSelectedAggregationOptions = function (
       formattedObservationsMaximumDailyNestedArr,
       extractedFormattedDatastreamProperties
     );
-  } else if (
-    selectedAggregationTypeArr === "Maximum" &&
+  }
+  // Monthly / maximum
+  else if (
+    selectedAggregationType === "Maximum" &&
     selectedAggregationDuration === "Monthly"
   ) {
-    // Formatted observations and metadata for chart - monthly / maximum
     const [
       formattedObservationsMaximumMonthlyNestedArr,
       extractedFormattedDatastreamProperties,
     ] = calculateAndFormatMonthlyMaximumObservations(
       uniqueCalendarDatesNestedArr,
-      observationsAggregationNestedArr,
+      observationsNestedArr,
       selectedSamplingRateAbbrev,
       formattedMetadataNestedArr
     );
@@ -117,8 +121,10 @@ export const drawColumnChartBasedOnSelectedAggregationOptions = function (
       formattedObservationsMaximumMonthlyNestedArr,
       extractedFormattedDatastreamProperties
     );
-  } else if (
-    selectedAggregationTypeArr === "Minimum" &&
+  }
+  // Daily / minimum
+  else if (
+    selectedAggregationType === "Minimum" &&
     selectedAggregationDuration === "Daily"
   ) {
     // Formatted observations and metadata for chart - daily / minimum
@@ -127,7 +133,7 @@ export const drawColumnChartBasedOnSelectedAggregationOptions = function (
       extractedFormattedDatastreamProperties,
     ] = calculateAndFormatDailyMinimumObservations(
       uniqueCalendarDatesNestedArr,
-      observationsAggregationNestedArr,
+      observationsNestedArr,
       selectedSamplingRateAbbrev,
       formattedMetadataNestedArr
     );
@@ -136,17 +142,18 @@ export const drawColumnChartBasedOnSelectedAggregationOptions = function (
       formattedObservationsMinimumDailyNestedArr,
       extractedFormattedDatastreamProperties
     );
-  } else if (
-    selectedAggregationTypeArr === "Minimum" &&
+  }
+  // Monthly / minimum
+  else if (
+    selectedAggregationType === "Minimum" &&
     selectedAggregationDuration === "Monthly"
   ) {
-    // Formatted observations and metadata for chart - monthly / minimum
     const [
       formattedObservationsMinimumMonthlyNestedArr,
       extractedFormattedDatastreamProperties,
     ] = calculateAndFormatMonthlyMinimumObservations(
       uniqueCalendarDatesNestedArr,
-      observationsAggregationNestedArr,
+      observationsNestedArr,
       selectedSamplingRateAbbrev,
       formattedMetadataNestedArr
     );
@@ -155,17 +162,18 @@ export const drawColumnChartBasedOnSelectedAggregationOptions = function (
       formattedObservationsMinimumMonthlyNestedArr,
       extractedFormattedDatastreamProperties
     );
-  } else if (
-    selectedAggregationTypeArr === "Average" &&
+  }
+  // Daily / average
+  else if (
+    selectedAggregationType === "Average" &&
     selectedAggregationDuration === "Daily"
   ) {
-    // Formatted observations and metadata for chart - daily / average
     const [
       formattedObservationsAverageDailyNestedArr,
       extractedFormattedDatastreamProperties,
     ] = calculateAndFormatDailyAverageObservations(
       uniqueCalendarDatesNestedArr,
-      observationsAggregationNestedArr,
+      observationsNestedArr,
       selectedSamplingRateAbbrev,
       formattedMetadataNestedArr
     );
@@ -174,17 +182,18 @@ export const drawColumnChartBasedOnSelectedAggregationOptions = function (
       formattedObservationsAverageDailyNestedArr,
       extractedFormattedDatastreamProperties
     );
-  } else if (
-    selectedAggregationTypeArr === "Average" &&
+  }
+  // Monthly / average
+  else if (
+    selectedAggregationType === "Average" &&
     selectedAggregationDuration === "Monthly"
   ) {
-    // Formatted observations and metadata for chart - monthly / average
     const [
       formattedObservationsAverageMonthlyNestedArr,
       extractedFormattedDatastreamProperties,
     ] = calculateAndFormatMonthlyAverageObservations(
       uniqueCalendarDatesNestedArr,
-      observationsAggregationNestedArr,
+      observationsNestedArr,
       selectedSamplingRateAbbrev,
       formattedMetadataNestedArr
     );
diff --git a/public/js/src_modules/dropDownListChartLine.mjs b/public/js/src_modules/dropDownListChartLine.mjs
index 70e721de83a9cce34dc1a402b90f32d315688c1e..494e466c718cdd041267ee95b4ae31fca1d50b18 100644
--- a/public/js/src_modules/dropDownListChartLine.mjs
+++ b/public/js/src_modules/dropDownListChartLine.mjs
@@ -27,7 +27,7 @@ import {
  *
  * @param {String} selectedAggregationType A string representing the selected aggregation type. The currently supported strings include `Sum`, `Maximum`, `Minimum` and `Average`
  * @param {String} selectedAggregationDuration A string representing the selected aggregation duration. The currently supported strings include `Daily` and `Monthly`
- * @param {Array} observationsAggregationNestedArr An array made up of sub-array(s) of aggregated observations
+ * @param {Array} observationsNestedArr An array made up of sub-array(s) of observations
  * @param {String} selectedSamplingRateAbbrev A string representing the abbreviated form of the selected sampling rate option
  * @param {Array} uniqueCalendarDatesNestedArr An array made up of sub-array(s) of unique calendar date(s) string(s)
  * @param {Array} formattedMetadataNestedArr An array of sub-arrays of formatted metadata properties
@@ -36,162 +36,124 @@ import {
 export const drawLineChartBasedOnSelectedAggregationOptions = function (
   selectedAggregationType,
   selectedAggregationDuration,
-  observationsAggregationNestedArr,
+  observationsNestedArr,
   selectedSamplingRateAbbrev,
   uniqueCalendarDatesNestedArr,
   formattedMetadataNestedArr
 ) {
+  // Daily / sum
   if (
     selectedAggregationType === "Sum" &&
     selectedAggregationDuration === "Daily"
   ) {
-    // Formatted observations and metadata for chart - daily / sum
-    const [
-      formattedObservationsSumDailyNestedArr,
-      extractedFormattedDatastreamProperties,
-    ] = calculateAndFormatDailySumObservations(
-      uniqueCalendarDatesNestedArr,
-      observationsAggregationNestedArr,
-      selectedSamplingRateAbbrev,
-      formattedMetadataNestedArr
-    );
-
+    // Note: The `drawColumChart` function expects two arguments,
+    // these are obtained by using the spread operator on the
+    // result returned from the `calculateAndFormat...` functions
     drawLineChartHighcharts(
-      formattedObservationsSumDailyNestedArr,
-      extractedFormattedDatastreamProperties
+      ...calculateAndFormatDailySumObservations(
+        uniqueCalendarDatesNestedArr,
+        observationsNestedArr,
+        selectedSamplingRateAbbrev,
+        formattedMetadataNestedArr
+      )
     );
-  } else if (
+  }
+  // Monthly / sum
+  else if (
     selectedAggregationType === "Sum" &&
     selectedAggregationDuration === "Monthly"
   ) {
-    // Formatted observations and metadata for chart - monthly / sum
-    const [
-      formattedObservationsSumMonthlyNestedArr,
-      extractedFormattedDatastreamProperties,
-    ] = calculateAndFormatMonthlySumObservations(
-      uniqueCalendarDatesNestedArr,
-      observationsAggregationNestedArr,
-      selectedSamplingRateAbbrev,
-      formattedMetadataNestedArr
-    );
-
     drawLineChartHighcharts(
-      formattedObservationsSumMonthlyNestedArr,
-      extractedFormattedDatastreamProperties
+      ...calculateAndFormatMonthlySumObservations(
+        uniqueCalendarDatesNestedArr,
+        observationsNestedArr,
+        selectedSamplingRateAbbrev,
+        formattedMetadataNestedArr
+      )
     );
-  } else if (
+  }
+  // Daily / maximum
+  else if (
     selectedAggregationType === "Maximum" &&
     selectedAggregationDuration === "Daily"
   ) {
-    // Formatted observations and metadata for chart - daily / maximum
-    const [
-      formattedObservationsMaximumDailyNestedArr,
-      extractedFormattedDatastreamProperties,
-    ] = calculateAndFormatDailyMaximumObservations(
-      uniqueCalendarDatesNestedArr,
-      observationsAggregationNestedArr,
-      selectedSamplingRateAbbrev,
-      formattedMetadataNestedArr
-    );
-
     drawLineChartHighcharts(
-      formattedObservationsMaximumDailyNestedArr,
-      extractedFormattedDatastreamProperties
+      ...calculateAndFormatDailyMaximumObservations(
+        uniqueCalendarDatesNestedArr,
+        observationsNestedArr,
+        selectedSamplingRateAbbrev,
+        formattedMetadataNestedArr
+      )
     );
-  } else if (
+  }
+  // Monthly / maximum
+  else if (
     selectedAggregationType === "Maximum" &&
     selectedAggregationDuration === "Monthly"
   ) {
-    // Formatted observations and metadata for chart - monthly / maximum
-    const [
-      formattedObservationsMaximumMonthlyNestedArr,
-      extractedFormattedDatastreamProperties,
-    ] = calculateAndFormatMonthlyMaximumObservations(
-      uniqueCalendarDatesNestedArr,
-      observationsAggregationNestedArr,
-      selectedSamplingRateAbbrev,
-      formattedMetadataNestedArr
-    );
-
     drawLineChartHighcharts(
-      formattedObservationsMaximumMonthlyNestedArr,
-      extractedFormattedDatastreamProperties
+      ...calculateAndFormatMonthlyMaximumObservations(
+        uniqueCalendarDatesNestedArr,
+        observationsNestedArr,
+        selectedSamplingRateAbbrev,
+        formattedMetadataNestedArr
+      )
     );
-  } else if (
+  }
+  // Daily / minimum
+  else if (
     selectedAggregationType === "Minimum" &&
     selectedAggregationDuration === "Daily"
   ) {
-    // Formatted observations and metadata for chart - daily / minimum
-    const [
-      formattedObservationsMinimumDailyNestedArr,
-      extractedFormattedDatastreamProperties,
-    ] = calculateAndFormatDailyMinimumObservations(
-      uniqueCalendarDatesNestedArr,
-      observationsAggregationNestedArr,
-      selectedSamplingRateAbbrev,
-      formattedMetadataNestedArr
-    );
-
     drawLineChartHighcharts(
-      formattedObservationsMinimumDailyNestedArr,
-      extractedFormattedDatastreamProperties
+      ...calculateAndFormatDailyMinimumObservations(
+        uniqueCalendarDatesNestedArr,
+        observationsNestedArr,
+        selectedSamplingRateAbbrev,
+        formattedMetadataNestedArr
+      )
     );
-  } else if (
+  }
+  // Monthly / minimum
+  else if (
     selectedAggregationType === "Minimum" &&
     selectedAggregationDuration === "Monthly"
   ) {
-    // Formatted observations and metadata for chart - monthly / minimum
-    const [
-      formattedObservationsMinimumMonthlyNestedArr,
-      extractedFormattedDatastreamProperties,
-    ] = calculateAndFormatMonthlyMinimumObservations(
-      uniqueCalendarDatesNestedArr,
-      observationsAggregationNestedArr,
-      selectedSamplingRateAbbrev,
-      formattedMetadataNestedArr
-    );
-
     drawLineChartHighcharts(
-      formattedObservationsMinimumMonthlyNestedArr,
-      extractedFormattedDatastreamProperties
+      ...calculateAndFormatMonthlyMinimumObservations(
+        uniqueCalendarDatesNestedArr,
+        observationsNestedArr,
+        selectedSamplingRateAbbrev,
+        formattedMetadataNestedArr
+      )
     );
-  } else if (
+  }
+  // Daily / average
+  else if (
     selectedAggregationType === "Average" &&
     selectedAggregationDuration === "Daily"
   ) {
-    // Formatted observations and metadata for chart - daily / average
-    const [
-      formattedObservationsAverageDailyNestedArr,
-      extractedFormattedDatastreamProperties,
-    ] = calculateAndFormatDailyAverageObservations(
-      uniqueCalendarDatesNestedArr,
-      observationsAggregationNestedArr,
-      selectedSamplingRateAbbrev,
-      formattedMetadataNestedArr
-    );
-
     drawLineChartHighcharts(
-      formattedObservationsAverageDailyNestedArr,
-      extractedFormattedDatastreamProperties
+      ...calculateAndFormatDailyAverageObservations(
+        uniqueCalendarDatesNestedArr,
+        observationsNestedArr,
+        selectedSamplingRateAbbrev,
+        formattedMetadataNestedArr
+      )
     );
-  } else if (
+  }
+  // Monthly / average
+  else if (
     selectedAggregationType === "Average" &&
     selectedAggregationDuration === "Monthly"
   ) {
-    // Formatted observations and metadata for chart - monthly / average
-    const [
-      formattedObservationsAverageMonthlyNestedArr,
-      extractedFormattedDatastreamProperties,
-    ] = calculateAndFormatMonthlyAverageObservations(
-      uniqueCalendarDatesNestedArr,
-      observationsAggregationNestedArr,
-      selectedSamplingRateAbbrev,
-      formattedMetadataNestedArr
-    );
-
     drawLineChartHighcharts(
-      formattedObservationsAverageMonthlyNestedArr,
-      extractedFormattedDatastreamProperties
+      ...calculateAndFormatMonthlyAverageObservations(
+        uniqueCalendarDatesNestedArr,
+        observationsNestedArr,
+        selectedSamplingRateAbbrev,
+        formattedMetadataNestedArr
+      )
     );
   }
 };