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This can be done, however, it sounds like you'd like the overlaying parts to be different colors? That currently is not possible using reference lines--might make a good one for the Ideas section.
Thank you Tracy, I will add it there.
I actually figured this one out, and it was far more simple than I thought. I simply filled in one side of the first line (in red). And then filled one side of the other line as white. Only 1 quadrant of interest was colored in red.
Different color schemes beyond that would be nice, as I think this only allows you to fill 1 quadrant with 1 color.