[FIXED] The shaded area derived from fill_between has a white border

Issue

I have plotted some training curves where the shaded area represents the standard error. The shaded area is realized with the fill_between method in Matplotlib. However, the derived .eps figure showed that the shaded areas have white borders, which can be observed in the below figure.

How can I remove these borders or set the edgecolor to the same as the facecolor and change its opacity?

The answer here only changes the edgecolor's opacity.

I have changed the edgecolor via edgecolor=face but got solid line borders. Changing alpha of edgecolor=(R,G,B,alpha) seems useless to me. I want to further adjust the opacity of edgecolor.

Solution

This sounds similar to the problem in this question where edges show up in saved PDFs. I can't test this without some example code of your problem, but if you can access the artists drawn onto the axis by fill between and set their edgecolor="face" then this may solve your issue.

Update: As mentioned in the comments below, it is additionally necessary to set the linewidth as described in this question

Answered By - Tom Wagg