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Dear all We have this simple script to open a volume (#0) coloured using values from a second volume (#1): open betaGal.mrc open extra/MG_Chimera_resolution.vol volume #1 voxelSize 3.54 vol #1 hide scolor #0 volume #1 cmap rainbow reverseColors True For scolor command we are using a volume. https://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/scolor.html#volume It would be nice to achieve something like this at start up (note the color key is based on the volume): I've did it dragging the mouse over the canvas while "Color key" utility is open. And, is there a posibility to round up the values. Some kind of: Psaudocode: Give the resulting color key for each round values display the color key I guess that if there is a way to get the color key, then rest can be done through commands. Cheers, Pablo.