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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 ? -- ------------------------------------------------------------- Laurence H. Pearl PhD FMedSci Professor of Protein Crystallography and Section Chairman Section of Structural Biology, Institute of Cancer Research Chester Beatty Laboratories, 237 Fulham Road, London SW3 6JB Phone +44-(0)20 7153 5422 : Secretary 5443 : FAX 5457 ------------------------------------------------------------- "Live Simply and do Serious Things .. " - Dorothy Crowfoot Hodgkin ------------------------------------------------------------- The Institute of Cancer Research: Royal Cancer Hospital, a charitable Company Limited by Guarantee, Registered in England under Company No. 534147 with its Registered Office at 123 Old Brompton Road, London SW7 3RP. This e-mail message is confidential and for use by the addressee only. If the message is received by anyone other than the addressee, please return the message to the sender by replying to it and then delete the message from your computer and network.