Could it be that NCSMASK folded the mask back into an asymmetric unit?
My NCSMASK input file contains explicit xyzlim boundaries and "notrim"
keyword.
On Tue, 18 Mar 2008, Laurence Pearl wrote:
> I'm trying to generate a mask around a molecule using NCSMASK under the CCP4i
> interface, for ultimate use in NCS averaging and density modification in dm.
> Being a little old-fashioned I wanted to check that it covered the required
> molecule. However when displayed in COOT, there seem to be arbitary flat
> slabs running through the mask, with some sort of inversion or other
> transformation on the other side of the slab. The mask has a similar
> appearance in the CCP4mg. The flattenings are parallel to cell edges, and
> sometimes, but not always adjacent to cell faces.
>
> Is this a known problem ? is it NCSMASK ? or is it COOT and CCP4mg ?
>
>
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