delay Attempt to solve for the delay parameters. This can be a large sink of CPU time. This option rarely works and should be used with caution. nopassol Do not solve for bandpass shape. In this case if a bandpass table is present in the visibility data-set, then it will be applied to the data. interpolate Interpolate (and extrapolate) via a spline fit (to the real and imaginary parts) bandpass values for channels with no solution. This is commonly used because a set of channels are flagged, possibly because of RFI or spectral features in the bandpass calibrator. If less than 50% of the channels are good, the interpolation (extrapolation) is not done and those channels will not have a bandpass solution oldflux This causes MFCAL to use a pre-August 1994 ATCA flux density scale. See the help on "oldflux" for more information. noxyalign By default, when computing bandpasses for dual-feed antennas, MFCAL will write a solution in which the antenna gain phases for both feeds are the same and the bandpass phases for the Y feeds are not centered on zero. This allows for higher-sensitivity phase solutions during later calibration since one can solve for a single phase for each antenna using both X and Y data, if the bandpass solution has been applied. If this option is supplied, all of the bandpass phases will be centered on zero and the antenna gain phases for the two feeds on each antenna will differ.