r corr
i nchan
i npol
i nspect
d inttime
d sdf
a source
a telescop
d latitud
d longitu
i nants
d antpos
d sfreq
i ntimes
i nbls
i nblts
a visunits
a instrume
d antnums
d antnames
d lst
d ra
d dec
i pol
d cnt
d coord
d time
r baseline