nopol Do not apply polarization leakage correction. nocal Do not apply antenna gain correction. nopass Do not apply bandpass calibration correction. pseudo By default, tmcvt generates a visibility stream where the error from time mismatches is minimized for each output Stokes visibility. This usually results with different Stokes visibilities for a given baseline having different time tags. The "pseudo" option causes tmcvt to generate an output dataset where all the Stokes visibilities for a given baseline are pseudo-simultaneous (same time tag). This results in larger errors, but may be more convenient if you must form an output image where the beams are the same for the different Stokes parameters, or where you are going to written out to a FITS file.