Example of quality assessment for HARPS observations taken on November 11, 2019. Top panels: 60th spectral order magnitude, m₆₀, as a function of airmass (left) and hour angle (right). The black line and gray area show the best fit and ±1σ interval for the estimated jitter. Data points are color-coded with their assessed quality shown in the colorbar. Points with a quality flag > 0.9 are accepted (circles), and the rest are rejected (squares). The magnitude error bars are smaller than the markers. Bottom panel: radial velocity as a function of hour angle. It should be noted that the displayed RVs are still uncorrected for differential extinction.