Distribution of uncertainty on the weighted mean GBP value as a functionof the same G magnitude. The lines shown are equivalent to those of Fig. 9. In this case, the plot is restricted to all sources with 10 GBP observations. The green line shows the expected uncertainties for sources with 10 GBP transits and for a nominal mission with perfect calibrations. The red line shows the same uncertainty function, but with a calibration uncertainty of 5 mmag added in quadrature to the individual observations. The dashed black line has a slope of 0.4 and indicates that the faint end is sky dominated.
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