Gaia Data Release 2
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Table B.1

Definition of Priam processing flags, which have format 01ABCDE.

Position Value Meaning
A 0 parallax value is strictly positive (ϖ > 0)
1 parallax value is non-positive (ϖ ≤ 0) such that extinction estimate does not work
2 while ϖ > 0 the parallax error is σϖ > 1mas

B 0 both colours are close to the standard locus
1 below standard locus, i.e., GBPG > 0.1 and
2 above standard locus, i.e., (GGRP ) > (2.5 ⋅ ((GBPG) + 0.02)) or
(GGRP ) > (0.5 ⋅ ((GBPG) − 1.0) + 1.1)

C 0 GGRP colour is inside union of Teff and extinction training sets
1 GGRP colour is smaller than union of Teff and extinction training sets
2 GGRP colour is larger than union of Teff and extinction training sets

D 0 GBPG colour is inside union of Teff and extinction training sets
1 GBPG colour is smaller than union of Teff and extinction training sets
2 GBPG colour is larger than union of Teff and extinction training sets

E 1 input data was gold photometry
2 input data was silver photometry

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