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Please excuse my ignorance if this question is dumb, but what is the name of the kind of Chart 3? I've never seen one like it and it's fascinating to me - it seems like it's a 2d line graph with some shaded regions, but not a heat map.

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I don't have a name for that chart. It's a customized display I wrote that I found makes it easiest to view quote spreads and trades from multiple exchanges. I write in "c" combining simple graphics: lines, pixels and text.

Then I propose "TheNanex c chart". It's information rich, multi-multi-dimensional, and really tells the story in a nutshell.

I printed one out and put it on my "Tufte" shelf [1].

Edit: Add [1] https://en.wikipedia.org/wiki/Edward_Tufte

I am a big fan of Edward Tufte.

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