Re: [ccp4bb] crystal problems

2007-05-29 Thread Eleanor Dodson
Detwinning without a known structure, and such a high twin factor must be very unreliable . If you have only IT1 and IT2, the detwin algorithm gives I1 = (TF*It1 + (1-TF)*IT2) / (1-2*TF) (Maybe signs wrong there!) Since (1-2*TF) is almost 0, this is pretty inaccurate.. But if you have

[ccp4bb] crystal problems

2007-05-29 Thread Benirschke, Robert C.
Dear All, I had written earlier about my twinned crystal that was giving me problems..thanks to all who responded, it was very helpful. I have another couple questions about the same crystal that is confusing us. The twinned crystals space group is P3. Twinning was found using the Yeate