Temporal dependence of the detection efficiency, 1 − f(t_0i), on D1, with dates originating at January 0, 2003. The model (blue curve) is compared with Monte Carlo estimates (black points). Actual observation dates are shown as the lower red histograms. The bottom plot is for CCD 3 which failed to work during the second and the last two lunations. The top plot is for the rest of the mosaic.