CHECK AND ANALYSE UV VARIABLES

Miriad task smacheck can be used to check uv variables for SMA data and flag uv-data if the corresponding variables or data are out of range. Here is an exmaple to check the variable systemp, give a report on simple statistical analysis, and flag the uv data if systemp is outside the range as specified.

  Task:   smacheck
  vis      = gc_rx1.lsb
  flagval  = flag
  var      = systemp
  range    = 1,1200
  options  = histo

In the case of polarization observations, SMA archival data might also contain non-polarization data (ipol=0), in addition to the four polarization components. The Miriad smalod loads every data point from SMA archival data by converting MIR polarization state label (ipol) to the Miriad convention and retaining the non-polarization data unchanged. The non-polarization data might cause problem to the polarization calibration process in Miriad and needs to be flagged. For the circular polarization case, smacheck can flag the non-polarization data:

  Task:   smacheck
  vis      = uvtest_rx1.lsb
  flagval  = flag
  options  = circular