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Dear Eric Karg, if you want to cut the resolution by only a few tenth of A, it is sufficient to simply cut the resolution, e.g. within the refinement program. If the data you want to exclude are quite some part of the data, e.g. 30% or more, I would probably reprocess and rescale to be on the safe side. Best, Tim On 07/06/2015 06:04 PM, Eric Karg wrote: > Thank you for all your comments! I think it would be great to have the "paired refinement" implemented in future updates of refinement programs. > > Coming back to my original questions: if I have overestimated the high resolution cutoff, what is the correct procedure to refine against lower resolution data? Reprocessing the data from images to a lower resolution(xds..), truncating at the scaling step (aimless...) or setting the cutoff during refinement (phenix...)? How do I have to treat Rfree flags? > > Thanks! > -- -- Dr Tim Gruene Institut fuer anorganische Chemie Tammannstr. 4 D-37077 Goettingen phone: +49 (0)551 39 22149 GPG Key ID = A46BEE1A