Linear correlations (black solid lines) between the four data sets derived from the FWHM_DRS computed by the HARPS-N DRS with the G2 mask (x-axis) and the stellar equatorial velocity v_eq (y-axis) for our set of calibrators. The Spearman’s correlation coefficient r and p-value are shown in the plots. Upper left: linear correlation between FWHM_DRS and v_eq and relative residuals. Upper right: linear correlation between FWHM_mic and v_eq and relative residuals. Lower left: linear correlation between FWHM_mac and v_eq and relative residuals. Lower right: linear correlation between FWHM_mic+mac and v_eq and relative residuals.