ra: Gaia EDR3 right ascension (deg)
dec: Gaia EDR3 declination (deg)
pmra: Gaia EDR3 right ascension proper motion, if measured (mas/yr)
pmdec: Gaia EDR3 declination proper motion, if measured (mas/yr)
phot_bp_mean_mag: Gaia EDR3 blue-band mean photometry (mag)
bp_rp: Gaia EDR3 BP-RP color (mag)
x_plate: Centroid x-coordinate on plate scan (pixel)
y_plate: Centroid y-coordinate on plate scan (pixel)
RA_plate: Right Ascension, as measured on plate scan (deg)
Dec_plate: Declination, as measured on plate scan (deg)
omag: Magnitude as measured on the plate by Aperture Photometry Tool (mag)
radius: Distance from plate center (arcmin)
Separation: Distance between measured sky position on plate and by Gaia EDR3 (arcsec)
opg: “pg” magnitude of object as converted from Gaia EDR3 (mag)