[RF] Fix plotting with overlapping ranges.
[RF] Fix plotting with overlapping ranges.

When a NormRange with overlapping ranges was given, the plotting range
would be ignored.

olifre/root,olifre/root,karies/root,karies/root,olifre/root,karies/root,karies/root,olifre/root,root-mirror/root,root-mirror/root,root-mirror/root,karies/root,karies/root,root-mirror/root,karies/root,olifre/root,root-mirror/root,root-mirror/root,karies/root,olifre/root,olifre/root,karies/root,olifre/root,olifre/root,root-mirror/root,root-mirror/root,olifre/root,root-mirror/root,karies/root,olifre/root,karies/root,root-mirror/root,root-mirror/root