Figure 1.

Two-dimensional MEM EDDs of the 6R (top) and 8R (bottom), going from 0 e Å⁻² (blue) to 1 e Å⁻² (red), of (a) H-CHA, (b) Cu-CHA using only the framework as an MEM prior, and (c) Cu-CHA using the improved structure factors obtained from Rietveld analysis including the A′ and B sites in the structure model. (d) Ball-and-stick drawings of the 6R (top) and 8R (bottom) of Cu-CHA, showing the Cu²⁺ sites A′ (orange) and B (green), and the T sites (Si/Al, white) oxygen (red).