Would greatly appreciate help on this...

I need to shade above a line (i.e. between that line and the top of the graph) as well as below another line.

It's a river flow graph and the objective is to highlight another line that is mostly between the two lines I need to add shading to.

image one is the graph - linked below. I'm trying to shade above the blue and below the red

All the tutorials and questions I've found relate to shading between two lines or making the graph into an area graph - neither of which is a great fit.

Here's links to things I've found:

https://peltiertech.com/fill-under-between-series-in-excel-chart/ https://www.youtube.com/watch?v=6_vAhGwjWzA

THANK YOU!