Scripts for Step 1 - Prepare the continuum:

• step1_prepare_continuum.py # main script

• dictionary_data.py # loads data_dict

• step1_utils.py # loads multiple functions

• selfcal_utils.py # necessary for an initial round of selfcal at the end

Manual Flagging

During the Data Reduction Visit to the NAASC, we identified some flaggable issues during inspection of the weblog, namely bad antennas during the Tsys calibration in both the long-baseline and shore baseline data (see below). Flagging these data may have required redoing the pipeline calibration (and the pipeline took 4 days to run on the TM1 scheduling block). However, the guidance I received is they are not too serious, that self calibration would take care of them for us. As such, we opted not to do any manual flagging.

Execution block uid___A002_Xfbb255_X2286.ms in TM1: Vampire teeth in the XX correlation of SPW 23 in the Tsys calibration. Left: All antennas overlaid. Right: Antenna DV17 isolated. The problem is not visible in the plots where all antennas are overlaid. Something like this is easy to miss if you only check the plots that overlay all antennas.

Execution block uid___A002_Xf8f6a9_X15c79.ms in TM2: Nearly sinusoidal Tsys in the XX correlation of SPW 21 in the Tsys calibration. Left: All antennas overlaid. Right: Antenna DV03 isolated. Some wiggles are expected (that’s clouds), but perfectly sinusoidal is a bit strange.

Some examples of manual flagging can be found in the DSHARP scripts (e.g. IMLup_continuum.py).