Re: [ccp4bb] just how bad can phases be and still help

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Subject: Re: just how bad can phases be and still help
From: Sacha Urzhumtsev Alexander {- dot -} Ourjoumtsev {- at -} STMP {- dot -} UHP-NANCY {- dot -} FR
Date: 2007-09-10

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From: Stuart McNicholas mcnicholas {- at -} YSBL {- dot -} YORK {- dot -} AC {- dot -} UK
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Subject: Re: just how bad can phases be and still help
From: Sacha Urzhumtsev Alexander {- dot -} Ourjoumtsev {- at -} STMP {- dot -} UHP-NANCY {- dot -} FR
Date: 2007-09-10

Dear Bryan, dear all !

>>Low initial FOM in many senses are good [..] because density
>>modification has more latitude

Sorry for being late with my remark :

some theoretical results directly answering Bryan's practical
question are discussed by Lunin & Woolfson (1993) in Acta Cryst.,
D49, 530-533. Of course it is supposed that mean phase error (or FOM)
estimation is correct (that is often not the case). Also the result
is statistical and in practice the situation may vary from one
particular crystal to another.

Regards,

Sacha

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Previous message:
Subject: Re: just how bad can phases be and still help
From: Sacha Urzhumtsev Alexander {- dot -} Ourjoumtsev {- at -} STMP {- dot -} UHP-NANCY {- dot -} FR
Date: 2007-09-10

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