Hi Ed. According to: help(dx.map) Defaults dx.map(params=None, map_type='Iso3D', spin_id=None, inc=20, lower=None, upper=None, axis_incs=5, file_prefix='map', dir='dx', point=None, point_file='point', remap=None) remap: A user supplied remapping function. This function will receive the parameter array and must return an array of equal length. In pipe_control/opendx.py I cannot see it mapped to something useful? best Troels