The AMD reconstructed from all three epochs of GRS. Each color corresponds to different observations: gray for ObsID 7485, red for 23435+24663, and blue for 22213. For each observation the temperature of the disk blackbody is mentioned, as well as the total column density up to the decided cutoff; see Section 4.1 for details. On each AMD the H-like and He-like Fe points are marked, at their maximal ξ formation.