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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