Fill to next on a Polar graph

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Hi all,

I'd like to display a 1D wave (called E_mx), as well as its 95% confidence interval (so 2 1D wave called E_mx_up and E_mx_down), on a polar projection.
The regular graph (cartesian coordinates) give something very satisfactory using "Fill to next" for the E_mx_down trace. See image attached.
But whenever I try this on a polar graph, it doesn't do what it's supposed to do (or what I want it to do). Also see image attached. I thought it was a problem of trace order, but it doesn't have any impact.
Any hint?

Thanks!
J-E Fill to next.png (47.71 KB) Fill to next polar.png (55.02 KB)