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Fig. 4


Star-Mapper (SM) along-scan (AL) line-spread functions for all 448 combinations of 14 CCDs, 16 stellar spectral-energy distributions, and two values of interstellar extinction. Since the LSF size is primarily determined by the (local) optical quality of the telescope, which varies over the SM field of view (the wave-front error varies between 40 and 105 nm), the curves cluster in various families (see also Fig. 5). The curves do not include the effect of the on-chip binning of the SM pixels in 2 × 2 samples. Overplotted, for reference, are a Lorentzian in green (Eq. (8)), a Gaussian in red (Eq. (9)), and a sum of a Gaussian with weight 55% and a Lorentzian with weight 45% in cyan (Eq. (7)).

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