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Thanks Pavel. Its not huge, but I need to process massive cases. Svergun's envelope function or spherical harmonics expansion provides some concise mask description, but just not sure whether ccp4 or other facilities can generate it handy (from a pdb file to an atomic mask!) Thanks again! Hailiang > Hi Hailiang, > > I guess you can store the map in CCP4 map binary format or convert it into > corresponding Fourier map coefficients and store them in MTZ format (note: > in this case if you convert them back into a mask it will not be a binary > function anymore) - both shouldn't take a huge amount of space. > > Pavel. > > On Fri, May 20, 2011 at 8:14 PM, Hailiang Zhang <[log in to unmask]> wrote: > >> Hi, >> >> As I understand, the general molecular mask generated by CCP4 (eg >> sfall+mapmask) are binary mask file which needs lots of memory space. I >> just wonder whether we can generate some small mask files represented >> by, >> say, envelope function (F(sita,psi)) >> (http://journals.iucr.org/d/issues/2001/10/00/ba5001/ba5001.pdf). This >> will save lots of disc space and lots of efforts for my problem. Thanks! >> >> Hailiang >> >