Score | Reason |
---|---|
1.00 | Combined flagging score for uid___A002_Xeea188_X1f88.ms: multiplication of flagging scores for individual intents. |
1.00 | 0.00% of unflagged data with intent PHASE in uid___A002_Xeea188_X1f88.ms was newly flagged. |
1.00 | 0.00% of unflagged data with intent CHECK in uid___A002_Xeea188_X1f88.ms was newly flagged. |
This task computes the flagging heuristics on the phase calibrator and flux calibrator by calling hif_correctedampflag which looks for outlier visibility points by statistically examining the scalar difference of corrected amplitudes minus model amplitudes, and flags those outliers. The philosophy is that only outlier data points that have remained outliers after calibration will be flagged. The heuristic works equally well on resolved calibrators and point sources because it is not performing a vector difference, and thus is not sensitive to nulls in the flux density vs. uvdistance domain. Note that the phase of the data is not assessed.
In further detail, the workflow is as follows: an a priori calibration is applied using pre-existing caltables in the calibration state, a preliminary phase and amplitude gaincal solution is solved and applied, the flagging heuristics are run, and any outliers are flagged. Plots are generated at two points in this workflow: after preliminary phase and amplitude calibration but before flagging heuristics are run, and after flagging heuristics have been run and applied. If no points were flagged, the "after" plots are not generated or displayed. The score for this stage is the standard data flagging score, which depends on the fraction of data flagged.
Measurement Set | Flagging Commands | Number of Statements |
---|---|---|
uid___A002_Xeea188_X1f88.ms | uid___A002_Xeea188_X1f88.ms-flag_commands.txt | 0 |
Data Selection | flagged before | flagged after |
---|---|---|
TOTAL | 42.661% | 42.661% |
BANDPASS | 27.601% | 27.601% |
AMPLITUDE | 27.601% | 27.601% |
PHASE | 27.126% | 27.126% |
CHECK | N/A | N/A |
TARGET | 25.343% | 25.343% |
These plots show amplitude vs time for two cases: 1, the calibrated data before application of any flags; and 2, where flagging was applied, the calibrated data after application of flags.
Data are plotted for all antennas and correlations, with different correlations shown in different colours.
These plots show amplitude vs UV distance for two cases: 1, the calibrated data before application of any flags; and 2, where flagging was applied, the calibrated data after application of flags.
Data are plotted for all antennas and correlations, with different correlations shown in different colours.