j corr
i nspect
i nschan
i ischan
d sdf
d sfreq
d restfreq
r xtsys
r ytsys
i npol
i pol
r vsource
a version
r veldop
d ut
a telescop
a source
a project
a operator
i nants
d freq
d coord
d time
r baseline
i nchan
r tscale
