Hello, I just would guess that you have twinning and disorder of the 5th subunit around the 2-fold axis at the same time. The twinning in P3221 with operators HKL and KH-L (involving the full unit cell contents) is required to explain the observed twinning fraction whereas only the disorder can explain the electron density showing alternate orientations of the 5th subunit. Greetings Wim
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