Construction of a theoretical model for the distribution of σe. The blue line shows a model taking into account the theoretical noises plus the white and red noise values, as defined in Eq. (4). The brown line shows a model after introducing a correlative component between stars, as defined in Eq. (6). The red line shows a model after introducing correlations with the FWHM and the sky background, as defined in Eq. (10). The black line is the measured distribution σe, m. Only the 2011 winter is shown as an example.
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