Signal intensity slider for "signals" and "displacement / cumulative displacement" tabs in the "InterfaceFiguresTabs" notebook

[wldko]

What would be fantastic is a "contrast&brightness" adjustment bar on the "signals" and "displacement"/"cumulative displacement" tabs (much like in the "curvature" tab). Because of the bleaching, it would be nice to be able to enhance the later signal and see if something is there.