Comparison between radial velocities from Gaia DR2 and those from our SPC analysis. Left: difference in RV against the average, with the colours indicating the RUWE value from Gaia. The target with red errorbars is the one QF = 4 target with a Gaia RV. Right: distributions of the RV differences (both including and excluding targets with high RUWE (> 1.4) values), and RV uncertainties (see legend). For better visualisation we have increased the KDE values on the differences by a factor of 5.