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Version 1.9 Build 803

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Continuum polarimetry case

In the calibrater tool, select all data: source, gain and flux calibrators (Fields 9, 10, & 11), reset the tool state, set up to apply parallactic angle and flux-scaled gain solutions, and then correct the observed data, writing the result to the CORRECTED_DATA column in the measurement set:

calC.setdata(msselect='FIELD_ID IN [9:11]');  # Select sources in MS fields 
                                              #  9, 10 & 11 to which calibration  
                                              #  is to be applied 
calC.reset();                                 # Reset setapply/setsolve
calC.setapply(type='P',                       # Arrange to apply parallactic angle 
              t=5.0);                         #  correction on 5 sec intervals
calC.setapply(type='G',                       # Arrange to apply flux-scaled G 
              t=0.0,                          #  solutions from the ap366.fluxcal
              table='ap366.fluxcal');         #  table.
calC.state();                                 # Review setapply settings
calC.correct();                               # Apply solutions and write the
                                              #  CORRECTED_DATA column in the MS.

The calibrator.state and calibrator.correct functions will produce the logger messages:

  The following calibration components will be applied:
    G table=ap366.fluxcal t=0 select=[]
    P table=<pre-computed> t=5.0 select=[]
  The following calibration components will be solved for:
    None.
  Initializing non-solvable parallactic angle (P-matrix)
  For interval of 5 seconds, found 213 slots
  Applying G table from ap366.fluxcal

At this point, it is a good idea to examine the calibrated source data (CORRECTED_DATA column) with msplot and flag any bad data. The continuum data set doesn't have any bad source data so this step will be skipped.