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SMASPLT for 4 GHz Mode

For the data taken with 4 GHz mode, the pseudo-continuum channel (c1) is loaded by smalod to place at the first spectral band along with the spectral chunks (s1 to s48). The pseudo-continuum channels are useful for interferometer pointing and other purposes. However, since c1 only contains a single channel, the Miriad tasks with edge might run into problems in handling spectral data by dropping a few low-gain channels at the band edges. The Miriad task smasplt is suggested to run prior to further data reduction, which splits the spectral chunks from the pseudo-continuum band:
  Task:   smasplt
  vis      = 110622_rx0.usb
  out      = 110622_rx0.usb4GHz 
  options  = ifsall

Here 110622_rx0.usb is the output data from smalod containing c1 (the pseudo-continuum band), s1-s24 (the spectral chunks from the first IF bands) and s25-s48 (the spectral chunks from the second IF bands). 'options = ifsall' splits the all spectral chunks (s1 to s48) into the output file 110622_rx0.usb4GHz. With different options, smasplt gives selected data into the output file.



Jun-Hui Zhao (miriad for SMA)
2012-07-09