The `quality' given in this field is derived from information in
the GCRV (Wilson 1953) and the catalogue of Evans (1978), according to
which the estimated mean probable errors are `based upon three
factors: the number of observations, the dispersion of the
spectrograph used, and the interagreement of separate determinations'.
The radial velocities are characterised by five such values:
[][
a:] 0.5 km/s
[ b:] 1.2 km/s
[ c:] 2.5 km/s
[ d:] 5 km/s
[ e:] not given