Editing

After fringe-fitting and averaging, VLBA visibility amplitudes should be inspected and obviously discrepant points removed (Diamond 1995; Walker 1995b). Usually such editing is done interactively using tasks in AIPS or the Caltech program DIFMAP (Shepherd 1997). Note that VLBA correlator output data also will include a flag (FG) table derived from monitor data output, containing information such as off-source flags for the antennas during slews to another source.