Fitting empirical parameters describing short-term repeats of RV to GES iDR6 data (see Eq. B.1). Plot (a) shows the variation in parameter B with target T_eff. Plot (b) shows the variation in S_RV,0 with υ sin i, and plot (c) shows the variation with SNR. Plot (d) compares the cumulative distribution of the normalised measurement uncertainty for short term repeats E_RV/S_RV,0 (red line) with a unit Gaussian distribution (dashed line) and a ν = 3 Student's t-distribution (blue circles).