Thanks, it worked!
One more question: Is there anyway to have a discrete set of colors instead of continuous ones? My ROI #1 gets a mixed color of black (I guess default color for index 0) and the color I set for the index 1 in my color palette. When I click the " # " below the color bar, I see values up to 20 and then **, so wondering whether there is any way I can set it to certain number larger than 20. Or any other suggestion to avoid this color mixing?
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