Example of the Sky-Mapper (SM) PSF of a single, bright star (G ~ 13 mag) which has five associated local maxima, one of the star itself and four spurious ghosts in the wings. The five red squares indicate the 3 × 3-samples VPA working windows of the five local maxima. The horizontal axis denotes along-scan (AL) SM sample while the vertical axis denotes across-scan (AC) SM sample. The colour coding is logarithmic and shows the sample flux in LSB after on-board background subtraction. Single stars can have associated ghosts out to a few dozen SM samples from the star centre (our single-star simulations are based on a 40 × 40-samples grid).
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