'birdie' ATCA self-interference can corrupt channels at integral multiples of 128 MHz. The birdie option flags these channels. Additionally, in continuum (33 channels/128MHz) mode, the birdie option dicards every second channel, plus some edge channels. The channels discarded are those most likely affected by the self-interference. Discarding these channels does not have a sensitivity penalty, because the effective channel bandwidth is twice the channel separation. 'reweight' Re-weight the lag spectrum to eliminate the "Gibbs" phenomena. 'compress' Write output data in compressed format. 'noauto' Discard autocorrelation data. The default is to copy the autocorrelation data. 'nocross' Discard cross-correlation data. The default is to copy the cross correlation data. 'relax' Do not flag visibilities based on SYSCAL information. The default is to flag visibilities if they have not been preceded by a valid SYSCAL record, or if the the values in the SYSCAL record look bad. SYSCAL values are checked for sampler statistics being within 3% of 17.3%, or 0.5% of 50.0%, that the XY phase is within 10 degrees of its running median, and that the XY amplitudes are within 1 Jy or 10% of its running median. 'unflag' Save any data that is flagged. By default ATLOD discards most data that is flagged. 'samcorr' Correct the pre-Dec93 data for incorrect sampler statistics. Since December 1993, sampler corrections are performed online -- Miriad ignores the samcorr option for this data. 'xycorr' Apply the on-line measurement of the XY phase. 'hanning' Hanning smooth spectra and drop every other channel This option is ignored for 128-MHz, 33-channel data. 'bary' Use the barycentre as the velocity rest frame. The default is to use the LSR frame. 'noif' Do not map the simultaneous IFs to the IF axis. By default ATLOD attempts to map the simultaneous frequencies to the IF axis. This will not be possible if there are a different number of polarisations in the different IFs. 'nopflag' If at least one polarisation of a set of 2 or 4 polarimetric spectra are bad, ATLOD normally flags all of the polarisations. Option nopflag changes this so that only the nominally bad spectrum is flagged. 'hires' Treat bin data as measurements in the high time resolution mode. The output dataset contains no bins, but instead appears as data measured with small cycle times. 'pmps' Undo `poor man's phase switching'. This is an obscure option that you should not generally use. 'detail' Give a more detailed error log when loading.
NOTE: Using this feature to skip many files on a tape is VERY inefficient. It is far faster to skip using operating system commands. When doing this, however, you should be aware is that every RPFITS files consists of 3 tape files. Thus you will want to skip three times as many tape files as RPFITS files. For example, in UNIX, to skip 10 RPFITS files, use
mt -f /dev/nrst0 fsf 30