Hello everybody, 
I have been asked to produce a chart like this for an energetic domain: 

The idea is to have 2 energetic values: 

BLUE (upper value)
YELLOW (lower value)

then we have a threshold, the DOTTED value.

Customers pay only the energy > of the threshold AND < of YELLOW.

Any idea on how to do this? I already tried a solution, but also the energy 
< of threshold and > of YELLOW is colored: 


(the black area must be left not colored).

Thanks for any suggestion!

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