How filling all area between line x=0 and parametric curve a?
Algebraically all area = area1+area2+area3+area4+2*area5>1.
How filling all area with twice area5?
the old versions colored all points inside a polygon. Now only inside an odd number of times are colored
you can do a polygon for zone 5 and colour it handly like in attached
I think this is an error of desing because then the inverse filling is wrong
A workaround (approximation)
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