Extended Data Fig. 3: Assessment of the instrument linearity.
Panels (a-c) display a scatter plot that compares the instrumental magnitudes against the catalog magnitudes for the 13-cm Newtonian, 10.7-cm refractor, and 12-inch RC telescopes, respectively. The red lines denote the best-fit linear regressions. Panels (d-f) display the residuals from the regressions. A horizontal red dashed line at zero serves as a reference. The error bars indicate 1-σ uncertainties of instrumental and catalog magnitudes.
