13.4 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). VLBA correlator output data also includes a flag (FG) table derived from monitor data output, containing information such as off-source flags for the stations during slews to another source.