This image shows some kind of simple table that could be converted to a wikitable. Storing tables as images makes it harder to change (update, translate, ...) them. Wikitables also help making sure to be consistent in font and size.
Summary
Description2017 UK General Election Gallagher Index.png
English: A table showing the disproportionality of the 57th House of Commons of the United Kingdom.
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http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse
Original upload log
The original description page was here. All following user names refer to en.wikipedia.