CloudCompare forum

thank you...very grateful for your help. Does the screen shot below illustrate the approach you are describing?
in this shot, red upper limit is .2 and pink lower limit is .21 in this shot, an additional red keypoint placed at .21 between red upper limit and pink upper limit

Yes but to avoid any issue you should leave a very small space in-between (i.e. something very small like 0.00001 - i.e. instead of setting the second red step at 0.21, you could set it at 0.299999) otherwise the colors may be inverted afterwards (when CC sorts them, etc.).