Hi,

I am currently thinking about doing a heatmap for data visualization,
but I have very little experience with any type of graphical tools in
ruby (like the various SVG libs etc).

So I was hoping someone could point me in the right direction and save
me some time trying out useless libraries ;) Doesn't have to be ruby
either, but that way I could probably integrate it more easily into my
analysis pipeline.

Thanks,

Marc
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