Hi, I frequently use phenix.map_to_structure_factors to generate mtz files from EM maps for use in Coot - it is by far the best tool I have found for this purpose. For convenience (so I can easily build and refine one protomer of a four-fold symmetric entity), I often convert these mtz files from the default P1 to P4 spacegroup using CCP4, and I wonder if it would be possible to include an option to specify the output spacegroup directly in map_to_structure_factors (or perhaps it is there and I have missed it?)? Even better would be if there were a way to check the symmetry and refine the orientation of the input volume such that the map is centered in the unit cell and the symmetry axis of the volume is appropriately aligned - often I have aligned the input volume to another reference volume in Chimera, and if the alignment is not perfect the symmetry axis of the volume might be slightly misaligned from what would become the fourfold axis of the output. Cheers, Oli.