Table S3.

Estimated twin fractions for RT XFEL datasets after correction of indexing ambiguity

Twin test	Low pH (5.5)	Intermediate pH (6.5)	High pH (8.0)
Britton analyses	0.057	0.091	0.072
H test	0.185	0.244	0.166
Maximum-likelihood method	0.026	0.068	0.043