The chapter that builds the map: every GEX level the framework reads, where each comes from in the data, and what each does in a session.
A level is a piece of the map, and the map is only useful when every piece is read for what it actually is.
At 9:47 in the morning, SPX is holding 6,612. The gamma flip is at 6,600. Resistance sits at 6,625. The Call Wall is at 6,675. The expected-move upper boundary is 6,630. There is a pin developing at 6,605.
Those numbers make a map, and like any map, it is only useful if you know what each element represents, how it was derived, and what it means for the decision in front of you.
The full chapter as a PDF, figures included.
From the book; page layout may differ from the printed edition.