Dear all, I am having a question about map calcultation. I want to calculate a 2mFo-DFc map and a mFo-DFc map to 2.0 angstrom from xxx.pdb and yyy.mtz, and zzz.cif should be supplied. Unit cell dimension and symmetry information is in the mtz file. It seems that phenix.maps can do the job, but I did not find a good document on how to run it. In its help information, a parameter file is needed. I tried do use parameter file for refinement, which has been successfully used for phenix.refine, and I ran the command phenix.maps --unused_ok yyy.mtz xxx.pdb refine.param but phenix.maps report the error Traceback (most recent call last): File "/home/chene/phenix-1.3b-rc6/mmtbx/mmtbx/command_line/maps.py", line 7, in <module> maps.run(args=sys.argv[1:]) File "/home/chene/phenix-1.3b-rc6/mmtbx/mmtbx/maps.py", line 173, in run log = log) File "/home/chene/phenix-1.3b-rc6/mmtbx/mmtbx/maps.py", line 214, in __init__ self.data = utils.determine_data( AttributeError: 'module' object has no attribute 'determine_data' Does anyonw know what I should do to get the maps? Thanks Chen -- Chen Chen, Ph. D., Research Associate Center for Advanced Research in Biotechnology (CARB), University of Maryland Biotechnology Institute (UMBI), 9600 Gudelsky Drive, Rockville, MD 20850 Office Phone: 240-314-6122