Francis,
I would like to bring your attention to our paper in Acta Cryst D Volume
66 (6), 741-744 (2010) where we deal with spots under the ice-rings. We
have been very successful in eliminating the ice-rings and recover the
data underneath. If you are interested you can request the Python script
from Michael Chapman at OHSU.
De-icing: recovery of diffraction intensities in the presence of ice
rings, Michael S. Chapman and^^Thayumanasamy Somasundaram
If you need help please e-mail me outside the CCP4BB.
**
On 10/11/2011 11:16 AM, Francis E Reyes wrote:
> All,
>
>
> So I have two intense ice rings where there appear to be lattice spots in between them.
>
> I understand that any reflections that lie directly on the ice ring are useless, however, how do software programs (HKL2000, d*Trek, mosflm, XDS) deal with these intermediate spots?
>
> It would seem to me that employing a 'resolution cut off' just before the ice ring (on the low resolution side) would be improper, as there are spots on the high resolution side of the ice. (see enclosed .tiff)
>
>
> In fact, how do these programs deal with spots lying on ice rings? Are they rejected by some algorithm by those programs during integration, or is it up to the scaling/merging (by SCALA for example) step to deal with them?
>
> Thanks!
>
> F
>
>
>
> ---------------------------------------------
> Francis E. Reyes M.Sc.
> 215 UCB
> University of Colorado at Boulder
>
>
>
>
>
--
Dr. Thayumanasamy Somasundaram [Soma]
Director, X-Ray Crystallography Facility (XRF)
Off. Ph: (850)644-6448 | Lab Ph: (850)645-1333
Fax: (850)644-7244 | E-mail: [log in to unmask]
URI: www.sb.fsu.edu/~soma | URI: www.sb.fsu.edu/~xray
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Florida State University
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