line,nchan,start,width,stepThe default is all channels (or all wide channels if there are no spectral channels). The output will consist of only spectral or wideband data (but not both). If spectral averaging is performed (``width'' not equal to 1), then the output will be written as a single spectral window.
line,start,widthThe default is no reference line.
'nocal' Do not apply the gains file. By default, UVAMP applies the gains file in copying the data. 'nopol' Do not apply polarizatiopn corrections. By default UVAMP corrects for polarization cross-talk. 'nopass' DO not apply bandpass corrections. By default UVAMP corrects for the bandpass shape. 'ampscalar' Applies vector averaging to work out the averaged visibility phase, but scalar averaging to find the averaged visibility amplitude.