RMS of the four winter lightcurves as a function of stellar R magnitude. The theoretical stellar photon noise, readout noise, sky background noise, scintillation noise, and their quadratic sum are shown as long-dashed, dot-dashed, dotted, dashed, and plain lines respectively, in the case of circular PSFs and apertures. The theoretical noise for each star taking into account the PSF and aperture elongation is shown as black dots. The true and point-to-point RMS are shown as red and blue dots, respectively.
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