No He defined a fixed size which I was trying to avoid Also he messed up the fonts So far he hasn t responded to my talk page inquiry In the mean time I have uploaded a new version with a blue graph and a slightly increased font size and changed to font Verdana as per preference of Fred the Oyster It seems that MediaWiki always opts for a 512px width when no fixed size is available Take another look and let me know whether you want the size to be fixed