Five-year averaging is native to the NASA source for 2000m. Uploader performed 5-year averaging of the NOAA source's annual values, so that traces would be consistent.
Technical note: most SVG code for Version 7 was automatically generated by the "Line charts" spreadsheet linked at User:RCraig09/Excel to XML for SVG. Additions and adjustments were made in a text editor.
Source for Version 1, which includes raw data from which the above SVG chart was generated: Lindsey, Rebecca; Dahlman, Luann, Climate Change: Ocean Heat Content. climate.gov. National Oceanographic and Atmospheric Administration (NOAA) (17 August 2020). Archived from the original on 25 February 2023. Embedded data link leads to data that is more current than 2020 publication date of article.
Most of the SVG code for Version 1 was automatically generated by the "Vertical bar charts" spreadsheet linked at User:RCraig09/Excel to XML for SVG. Bars' colors were manually added, though possibly the "Warming stripes bar chart" spreadsheet could have achieved the same result more directly.
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