Hi Bernhard, When I have used the "convert" program via ccp4i, the cell and symmetry have indeed been read from the mmcif file and written to the MTZ file. Andrew On 16 May 2013, at 13:50, Bernhard Rupp wrote: > Dear Developers, > I wonder if there is any particular reason why, if present in an > mmcif, cell parameters and SG > are not read from the mmcif file when using ‘convert to mtz’? > > Best, BR >