Fig. 17
Top panel: robust dispersion of the radial velocity residuals as a function of the external 
magnitude for Gaia DR2 versus the CU6GB, SIM, RAVE, APOGEE, and GB validation datasets. Bottom panel: comparison of the precisions as a function of 
magnitude, estimated with the GB dataset (dashed black line) and the full dataset (blue line). The lower and upper 1σ uncertainties on the measures of the robust dispersion are represented as shaded areas.
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