# 10.2.6 Radial velocities and related data

In this section we look at $V_{\rm rad}$ related outputs of duplicate sources. There were 100 406 pairs of duplicated sources with $V_{\rm rad}$ data. The data for these pairs should be consistent given their errors, and thus, this set of sources offers a good opportunity for validation of $V_{\rm rad}$ data. In the plots where we compare the same quantity for the duplicated pairs, the horizontal axis shows the source that is kept in the catalogue, while the vertical one shows the eliminated source.

Figure 10.15 shows the comparison of the radial velocity (top) and its uncertainty (bottom) for the pairs. We see that most of the sources follow the 1 to 1 relation for this quantity, with a larger dispersion for small values of radial velocity. The error in radial velocity for the kept source is smaller than for the removed one for $59\%$ of pairs. This is roughly consistent with the fact that $69\%$ of pairs have more transits for the source that is finally kept in the catalogue.

The comparison between the templates used for each component of the duplicate pair is shown Figure 10.16. As we can see from the density of pairs, it seems that most of the pairs have used the exact or similar template. The fractions of pairs having exactly the same template are: $40\%$ for $\log g$, $86\%$ for [Fe/H], and $41\%$ for $T_{\rm eff}$.