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[ccp4bb]: I to F's

Dear CCP4 users;
I would like to know if someone could tell me what is the mathematical algorithmn
that is implemented in SCALEPACK2MTZ, when it converts I and sigmaI to F,sigmaF's,
Imean and sigmaImean, and also in TRUNCATE when it calculates DANO, sigmaDANO from
F(+) and F(-).

Basically, I would like to know the formulas used in such programs for converting
a sca file with anomalous signal to a mtz.

Thanks you all for helping.

Ronaldo Nagem.

 Ronaldo A. P. Nagem                         |
 Protein Crystallography Group               | E-mail:  nagem@lnls.br
 LNLS Laboratorio Nacional de Luz Sincrotron | Phone:   55-019-2874520
 Rua Giuseppe Maximo Scolfaro, 10.000 Guara  | Fax:     55-019-2877110
 CEP 13084-971 Campinas SP Brasil            | Website: www.lnls.br