i stumbled upon this one, in attempt to replace some of the math nodes (who only handle gray values) with vector curves
as vector curves can handle essentially 3 values at once and put 3 out (xyz => xyz) but i use it as (rgb =>rgb)
the backdraw is that such curves cannt be created by putting manual values, so one has to test first the upper one.
And if a noce pattern occurs then copy the node (Shift D) again so it can be placed below and be exact the same (which is needed).
As it is the random ofset that creates nice uneven width lines (see my earlier posting about how it can work using math nodes).
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