T_eff vs. velocity difference from the mean measured Li centroid position. Stars indicate the mean measured position for each target. The shaded boxes show the 1σ spread of measurements. Circles indicate that T_eff measurements are from ROFIT/PENELLOPE spectra, and triangles are taken from the TESS input catalogue. We note an anti-correlation (r = −0.58) between T_eff and mean position: lower T_eff stars show more redshifted central values. The total velocity error bars arise from adding the standard errors of the RV and Gaussian centre measurements in quadrature. Faded markers and error bars are measurements with total velocity errors 0.75 km s⁻¹. The mean measured Li centroid and positions of the D line components are indicated in the top histogram.