Residuals (Δlabel = GES − CNN) as a function of v sin i (km s⁻¹) for the train (blue), test (orange), and selected observed sample (green) stars. The observed sample is selected within training label limits, S/N > 10 pix⁻¹, E_VRAD < 0.5 km s⁻¹, with no GES flags and with Li measurement. The mean scatter of the residuals (σ) in the v sin i bins (≤10, (10,30], (30,50] and > 50) is also shown for each label.