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Note that for hybrid spectral resolutions across the multiple spectral
windows, in particular when very high spectral resolutions are
used for a few windows and the rest of are lower, the Miriad code
uvaver
treats all the spectral channels equally in averaging.
This may cause that the noise in the high spectral resolution
chunks dominates the continuum data. Users may separate the high
and low spectral chunks before forming continuum data using
uvaver. Or, user may resample the spectra while
the data is loaded to Miriad using task smalod. The antenna
gains might be derived from the uniformly sampled data set and then
copy to the spectral line data using gpcopy.
Jun-Hui Zhao (miriad for SMA)
2012-07-09