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Proper-motion information requires three columns: the separate components, and
the epoch of the catalog position.
We follow the SAO Catalog in using
annual proper-motion units of seconds of time per
year in R.A., and seconds of arc per year in Dec.
The epoch is given in decimal years.
The respective column labels are MUALPHA, MUDELTA, and EPOCH.
These are all Real*4 data.
http://www.eso.org/midas/midas-support.html
1999-06-15