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Just a correction - ccp4 had NOTHING to do with H32 definitions - just followed the wwwPDB requirements.. there were bitter arguments over accepting it from many! E Peter Zwart wrote: > Hi Stephen, > >> R32 >> H32 >> R32 :H > > Correct. These are all hexagonal setting. As far as I know, the > hexagonal setting of R32 (R32:H) is the first one that comes up in the > ITvA as is listed a R32. The rhombohedral/primitive setting of R32 > (R32:R) comes second in the ITvA, I guess the first setting takes > precedence. H32 is a pdb/ccp4ism. > > In my cctbx-skewed view, it looks like this: > > R32 == R32:H (== H32; not supported by the cctbx) > > R32:R is the primitive setting of R32:H > > Appending the setting to the space group makes life easier (no > ambiguities) and you can do more funky stuff if one has the > stomach/need to do so [like "P212121 (a+b,a-b,c)" ]. > > > HTHP