Average self-calibration solutions computed from different frequencies into a single one,.
FileFilter is a character string handling a filter to define all files storing the selected antenna gain solutions (files specified by SELF_SNAME in the SELFCAL command).
MergedFile is the SNR weighted average of all selected self-calibration solutions. The averaging of phases is made in DELAY mode, i.e. assuming the self-calibration phases are actually Pathlengths (Delays) at the calibration frequency.
The reference antenna can optionally be changed for simpler display in this process if argument ReferenceAntenna is present.