One page per object in the atlas, drawn as a map of what made it and what it made. For a decision: who decided it, who asked, who took part and what each argued, under what rule, and what it governs, with each document linked where it sits in the DPU’s file room. For a layer or a figure: the records it was computed from. How one such map was made is on the methodology page. (Until October 2026 this page was called “chain of evidence”.)