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.

Contents

Flagging

Report Files
Measurement Set Flagging Commands Number of Statements
uid___A002_Xe20b32_X84e7.ms uid___A002_Xe20b32_X84e7.ms-flag_commands.txt 0

Flagged data summary

Measurement Set: uid___A002_Xe20b32_X84e7.ms

Summary of flagged data. Each cell states the amount of data flagged as a fraction of the specified data selection.
Data Selection flagged before flagged after
TOTAL 35.9% 35.9%
BANDPASS 20.2% 20.2%
AMPLITUDE 20.2% 20.2%
PHASE 20.3% 20.3%
CHECK 0.0% 0.0%
TARGET 20.2% 20.2%

Amplitude vs time

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.

uid___A002_Xe20b32_X84e7.ms

Spectral Window 16

Intents: PHASE
Fields: J0656-0323

Calibrated data before flagging.

Spectral Window 18

Intents: PHASE
Fields: J0656-0323

Calibrated data before flagging.

Spectral Window 20

Intents: PHASE
Fields: J0656-0323

Calibrated data before flagging.

Spectral Window 22

Intents: PHASE
Fields: J0656-0323

Calibrated data before flagging.

Amplitude vs UV distance

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.

uid___A002_Xe20b32_X84e7.ms

Spectral Window 16

Intents: PHASE
Field: J0656-0323

Calibrated data before flagging.

Spectral Window 18

Intents: PHASE
Field: J0656-0323

Calibrated data before flagging.

Spectral Window 20

Intents: PHASE
Field: J0656-0323

Calibrated data before flagging.

Spectral Window 22

Intents: PHASE
Field: J0656-0323

Calibrated data before flagging.

Pipeline QA summary for this task.
Score Reason
1.00 Combined flagging score for uid___A002_Xe20b32_X84e7.ms: multiplication of flagging scores for individual intents.
1.00 0.00% of unflagged data with intent PHASE in uid___A002_Xe20b32_X84e7.ms was newly flagged.
1.00 0.00% of unflagged data with intent CHECK in uid___A002_Xe20b32_X84e7.ms was newly flagged.
niter
2
antblpossig
3.2
tmint
0.085
solint
inf
antpossig
4.6
minsnr
2.0
spw
16,18,20,22
vis
/opt/dared/opt/dared.2019AUG/mnt/dataproc/2019.1.00195.L_2019_10_13T21_07_41.359/SOUS_uid___A001_X146c_X95/GOUS_uid___A001_X146c_X9d/MOUS_uid___A001_X146c_Xa2/working/uid___A002_Xe20b32_X84e7.ms
antblnegsig
3.4
intent
PHASE,CHECK
output_dir
/opt/dared/opt/dared.2019AUG/mnt/dataproc/2019.1.00195.L_2019_10_13T21_07_41.359/SOUS_uid___A001_X146c_X95/GOUS_uid___A001_X146c_X9d/MOUS_uid___A001_X146c_Xa2/working
relaxed_factor
2.0
field
J0656-0323
tmantint
0.063
tmbl
0.175
refant
 
phaseupsolint
int
antnegsig
4.0
Start time
2019-10-13 21:37:44.933
End
2019-10-13 21:39:24.236
Duration
0:01:39.303
Note, WebLog generation is not included in the time.

CASA logs for stage 14