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Unit-cell volume changes with pressure for (A) (MA)PbBr3, (B) (MA)PbI3, (C) (MA)Pb(Br0.6I0.4)3, and (D) (MA)Pb(Br0.2I0.8)3. Second-order Birch–Murnaghan EOS fits (black lines) and fit parameters are shown. Open and closed symbols represent data from separate measurements.
