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There are two variants of both visualisations: one with white background and one with black. IMHO the graphs look better on white and the clouds on black background. I tried to create SVG variants, but they are huge. I also have these figures in 4096 x 3072, but I doubt anyone will need them — if you do, send me a message on last.fm and we'll see, they're roughly 10 Mbytes each in PNG format.
Graph visualisations
White background: 360x270, 800x600, 1280x960, 4096x3072 with artist names.
Black background: 360x270, 800x600, 1280x960, 4096x3072 with artist names.
