Fig. 4. (a) Predicted Cu site compositional phase diagram versus Si/Al and Cu/Al ratios. Color scale indicates predicted fraction of ZCu²⁺OH. Adapted with permission from ref. 85. Copyright 2016 American Chemical Society. (b) Relative fractions of Cu species; the label “other Cu²⁺” refers to very minor contributions from residual, partially hydrated Cu²⁺ species. Unpublished figure reporting data from ref. 86.