noflag Treat leakages that are identically 0 as good. noxy Do not solve for, or apply, the XY phase offset. apply Apply the solved for corrections to the vis data-set. The default is to solve for them only. xyleak GPNORM can determine the xy phase differences from both the gains table and polarisation leakages. By default, it assumes the gains-derived value should take precedence. The xyleak option causes GPNORM to take the leakage-derived value as the preferred on. This only has an effect if options=apply is used and options=noxy is not used.