[daip] How should I interpret this?

[Johan van der Walt]

I have started the editing and calibration of the data of a run we had
on the VLA in June. 

I have followed the procedure in section 4.3.1 (initial editing) and
noted that for a specific calibrator the values are round about 800 -
900 for about the first 40 seconds on the source. For the remaining 80
seconds on the source the values given by LISTR are between 80 and 90,
ie 10 times smaller than during the first 40 seconds. This applies to
all baselines. It also seems to occur only for one specific calibrator
source but not for everytime when it was observed.

Is this bad data? 

Johan