Se the twinning rules in http://www.ccp4.ac.uk/dist/html/twinning.html
P3
pace group number space group point group possible twin operators
143 P3 PG3 -h,-k,l; k,h,-l; -k,-h,-l
144 P31 PG3 -h,-k,l; k,h,-l; -k,-h,-l
145 P32 PG3 -h,-k,l; k,h,-l; -
Dear,
Sorry for the off-topic question.
I'm facing a (probably) merohedral twinning problem, regarding a small
molecule.
Using Xprep, I get a Hexagonal P-lattice with cell:
18.014 18.014 22.048 90.00 90.00 120.00
Mean |E*E-1| = 0.902 [expected .968 centrosym and .736 non-centrosym]
