Just because recently I read a discussion about where the point 2 should be located... If you look at the picture you will see that something doesn't look right. Points 1,2 and 3 and the corresponding peaks and throughs do they really match? There are some old drawings which confuse more than they help. In addition some of the "clean pages" that you posted might not be THE clean pages.
This particular 'clean page' emphasizes overlap,primarily. Maybe it`s not the 'clean pages',i don`t know.You can suggest yours.
Snake, this YM chart was created way back in 2004 or 2005, a time when full differentiation on the subject of gaussian was not achieved yet. I save your trouble by telling you that Frenchfry is 100% correct. Volume should tell you so. If you don't understand CP4, you are screwed for good. You don't want to miss the religious experience in CP4.