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 /
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