Hi Bryan, So, there are two answers to this question. If you are changing the spacegroup within the same lattice type (e.g. tP) then it is fine (this is probably what you mean by crystal system) - though you can do this by just running reindex "symm whatever" afterwards. If you want to change from one lattice to another (e.g. from oI to mC) then some recalulations will be necessary - the way I do this is as follows:
Run "othercell" a program from the pointless collection with the original unit cell and symmetry, work through the output to find the reindex operator for the target unit cell and symmetry, convert this to a matrix and multiply the A and U matrices in the mosflm matrix file by this amount. Remarkably, this works fine, and I do it all the time. Hope this helps. Cheers, Graeme -----Original Message----- From: CCP4 bulletin board [mailto:[EMAIL PROTECTED] On Behalf Of Bryan W. Lepore Sent: 24 September 2007 19:22 To: CCP4BB@JISCMAIL.AC.UK Subject: [ccp4bb] mosflm orientation matrix and symmetry does the mosflm orientation matrix specify the crystal system and only the crystal system? i.e, given an orientation matrix from autoindexing, it would be correct to simply use keyword 'SYMMETRY SPACEGROUP' in mosflm to refine then integrate in any of the spacegroups within a given crystal system from autoindexing? -bryan
