Effect of data binning on the RMS of one-day solar subseries (1996, black), on the synthetic times series generated with Eq. (3) (yellow), and on synthetic subseries of WGNs (blue). The RMS of the WGN series decreases as (light blue). Solid lines indicate the median values of the observed dispersion (shaded areas). The RMS of the time series at large bin sizes shows a significant dispersion as the number of data points decreases. Horizontal dotted lines indicate the fraction of a typical Earth-like transit depth (i.e., 84 ppm).