a observer
a telescop
a version
d latitud
i nants
r pbfwhm
a source
d ra
d dec
r epoch
d obsra
d obsdec
a veltype
r veldop
r vsource
d lo1
i nwide
r wfreq
r wwidth
i numchan
i nspect
d restfreq
d sfreq
d sdf
i nschan
i ischan
i npol
i cormode
r corfin
r corbw
d antpos
r inttime
d ut
d lst
r wsystemp
r systemp
i pol
r jyperk
c wcorr
j corr
d coord
d time
r baseline
i nchan
r tscale