You should be able to see three strips, each with 11 sections of cyan, magenta or yellow tones. The brightest sections should be pure white, the darkest should be pure cyan, magenta or yellow.
If you can't see all cyan sections, try to lighten or darken red
If you can't see all magenta sections, try to lighten or darken green
If you can't see all yellow sections, try to lighten or darken blue
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