[ccp4bb]: twining about P21, C2 or C2221

[xinqi liu <xinqi_1@yahoo.com>]

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Dear all,

   I checked the manual, it seems seldom that twinning
happens in P21, C2 and C2221 space group, but through
the truncate and twining check servicer, my data looks
like pefect-merohedral twinning, <I2>/<I>2 is 1.75. Is
it possible that twinning happens in this space group?
My data is one of three space group, I am not sure
which one is right. 
 The cell parameter is 
  P21 : 65.37, 275.29, 65.34, 90, 111.29, 90
  C2: 107.88, 74.56, 274.90, 90, 90.08, 90
  C2221: 74.58, 107.90, 274.78, 90, 90, 90.

If they are twinning, what is the twinning operator,
and should I do something else special?

Thank you all.

xinqi

HHMI & National Jewish Center.



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