r corr
d latitud
i npol
i nspect
d obsdec
r vsource
i ischan
a operator
i nants
r baseline
d sfreq
r inttime
a source
r epoch
a version
d ra
d restfreq
i nschan
d sdf
d freq
d longitu
i nchan
r tscale
d antpos
a telescop
i pol
d coord
r veldop
d lst
d time
d dec
d obsra