Diagrams with contrary colors, black = small, yellow = big area:
Generated with Wikimedia SVG Chart
Data format
The source data of the chart is in the SVG image file in a clearly readable format. You see the original numbers inside of the SVG file in the form of a list such as this:
...1995 10.061996 11.751997 12.45...
Content of SVG
To view the data download the SVG file itself. To do so right-click this link, and then choose the option to save: File:Sunspot butterfly diagram black.svg. Launch any text editor. Open the downloaded SVG file with the text editor (usually; file menu, open). To see the list of data, search for the phrase id="graph1".
Edit SVG
Please, do not use a special SVG editor such as Inkscape; the readability of the database would be destroyed. You can edit the SVG file with any text editor, for example; en: List of text editors. You can view the edited SVG file in various web browsers. As of 2011, all major desktop browsers, and many minor ones, have some level of SVG support. See: en: Scalable Vector Graphics#Support for SVG in web browsers. When satisfied with your edits, upload the edited SVG file with the link labeled "Upload a new version of this file".
After that the coordinates are rounded to 0.5 units.
The named unit ppm means the size of millionths of half Sun's hemisphere.
Areas lower than 2 millionths after the year 1976 are hidden. Because relevant sizes are e. g. 1000 millionths.
Every year is shown a group of values for each month, that means 12 groups per year. On an Latitude the size of of available spots in a month will be averaged.