Phased light curves for the short-arc, astrometric + photometric model (top). It shows the first occultation of Linus and the second transit of Linus, together with the reference light curves. The observed light curve is plotted as blue (with error bars), the synthetic as yellow, the residuals as red. The shades of blue correspond to the Julian date. The drop in brightness is up to 0.05 mag. Both the amplitude and duration of the events are in agreement. For comparison, we also plot the difference О − С (bottom). Remaining systematics occur on all light curves; so they must be related to the shape, not the occultations. The contribution to χ² is , n_lc = 1829.