When trying to set alpha for lines in a parallelcoords-plot I stumbled on the command:
lineobject(i).Color(4) = 0.5;
It works but I don't understand what the number "4" means? When trying different inputs I noticed that Colors accepts integers in the range 1-4 and 1-3 looks to be specific hues of red, green and blue. But what does "4" mean and why do I have to specify Color(4) to be able to set the alpha?
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