[cctbxbb] subset of reflections from mtz object

Hi, I'm not as well versed using iotbx.mtz as I ought to be. I'd like to make a subset of reflections from an mtz file bounded by a  chosen dmin and dmax, i.e. a resolution shell of reflections. What is the best way of doing this in python? Many thanks, Rob -- Robert Oeffner, Ph.D. Research Associate, The Read Group Department of Haematology, Cambridge Institute for Medical Research University of Cambridge Cambridge Biomedical Campus Wellcome Trust/MRC Building Hills Road Cambridge CB2 0XY www.cimr.cam.ac.uk/investigators/read/index.html tel: +44(0)1223 763234