Hi Rob, from iotbx import mtz mtz_obj = mtz.object(file_name="file_name.mtz") miller_arrays = mtz_obj.as_miller_arrays() for miller_array in miller_arrays:   miller_array_truncated = miller_array.resolution_filter(d_min=2, d_max=5) For more use example have a look at cctbx_project/iotbx/mtz/tst.py and as always "print dir(miller_array)" is your friend! Hope this helps! Pavel On 7/18/18 08:46, Robert Oeffner wrote:

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