Question: Fill-up area in plot

Hello

I would like to fillup the area between multiple function in my plot.

The plot consist out of multiple functions. Each function connects to one another.

In total there are 10 functions that define the border. The grey horizontal lines (PL4 and PL7) and all red lines PL8 - PL15.

I tried to find codes, but i cant get them to work.

 

 

Thanks a lot for any help!

 

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