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This Circos tutorial showed configuring spacing between two chromosomes, so track legend can be placed in the area. example
(source: circos.ca)

Like the the example above, but I can't find any explanation about how to draw text there just like right circle.

Is it possible to draw track legend using configuration file, or I need to use a graphic editor add text manually on the output image?

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Meow
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    You add the legend between chr1 and chrY manually, using picture editor, like inkskape, photoshop, etc. I don't think circos can add those legends as that coordinate is outside the ideogram. – zx8754 Dec 17 '14 at 21:41
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    @zx8754 Well, that is a pretty lame way considering if I made some tweaks to the configuration file, I had to manually add legend all over again. Circos should have come up with its own way to draw them using a configurable method. – Meow Dec 18 '14 at 01:26
  • I ended up keeping legend separate from the plot, in my case it made sense as I have more space on the ideogram. Also, GoogleGroups is more active place for support. – zx8754 Dec 18 '14 at 06:48

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