Hi Ed
Negative and 0 Fobs are not allowed and they are removed from
consideration and flagged as unmeasured in the current version.
However you can have negative I (if you are using intensities in TWIN
mode). If you are using this after sampling the perhaps sampling
should be done using intensities and converted to F (or used directly)
Garib
On 11 Dec 2009, at 23:43, Ed Pozharski wrote:
Does anyone know if REFMAC has any SIGFP cutoff? I looked into manual
but perhaps missed it. What I mean is abnormal situation where some
FOBS are 0 or even negative - is there any intrinsic cutoff or
refinement will be done against all the reflections?
Thanks,
Ed.
--
Edwin Pozharski, PhD, Assistant Professor
University of Maryland, Baltimore
----------------------------------------------
When the Way is forgotten duty and justice appear;
Then knowledge and wisdom are born along with hypocrisy.
When harmonious relationships dissolve then respect and devotion
arise;
When a nation falls to chaos then loyalty and patriotism are born.
------------------------------ / Lao Tse /
