• The outer 10% of all channels in both data containers are ignored.
• Blanked data values are ignored.
• The tcal value used here comes from the dc_nocal data container unless the user supplies a value in the tcal keyword.
• The tcal value actually used is returned in used_tcal.

This is used by the GUIDE calibration routines and is encapsulated here to ensure consistency.

Version

$Id$

Parameters
dc_nocal in, required spectrum data container	The data with no cal signal.
dc_withcal in, required spectrum data container	The data with a cal signal.

Keywords
tcal in, optional float	A scalar value for the cal temperature (K). If not supplied. dc_nocal.mean_tcal will be used.
used_tcal out, optional variable	The tcal value actually used.