For this type of plots I like better graded tone one color than multicolor, which I find less intuitive to read. Perhaps colors can be chosen so they follow a gradation from one extreme to the other, so reading the intensity transitions is easier for dumb-old-school users like me.
Other than that those graphs are great, arnaud. I'm willing to see the plots from the 009 and comparing them with the 007. I saw waterfalls of the 007 and it surprised me how resonant they seemed, which matches n3rdling comment. Maybe those measurements weren't properly made.