ra: the values of right ascension for each star in the Gaia EDR3 catalog, given in degrees.

dec: the values of declination for each star in the Gaia EDR3 catalog, given in degrees.

bp_rp: the values of bp magnitude minus rp magnitude for each star in the catalog.

pg: the adopted photographic magnitude for each star obtained from Gaia photometry via  pg = phot_bp_mean_mag +  (0.9*bp_rp).

ra_b: the values of right ascension for each star in the Barnard catalog, given in degrees.

dec_b: the values of declination for each star in the Barnard catalog, given in degrees.

mag: the magnitude measurement for each star, calibrated as described in the text.

rad: the distance of each star from the center of the plate, in units of degrees.

Separation: the distance between the star image on 10B-161 and the matched star in the Gaia catalog, in units of seconds of arc.