[ccp4bb]: Anomalous differences in ccp4i

[Phil Evans <pre@mrc-lmb.cam.ac.uk>]

***  For details on how to be removed from this list visit the  ***
***          CCP4 home page http://www.ccp4.ac.uk         ***



Beware of calculating anomalous difference Pattersons in ccp4i. Don't
use the option "anomalous difference Patterson". This calculates
differences from F(+) and F(-), and nowhere are these set equal for
centric data. Thus centric data get junk values and the Pattersons are
rubbish

The option "Patterson using anom diff (D) data" is correct since DANOM
is set to zero in Truncate for centrics.

I think this is probably a Truncate bug

The same may apply for setting up data for Rantan etc, but I haven't
checked

	Phil