Left: Detection efficiency as a function of magnitude with a 3σ detection threshold. Each curve is based on 30 000 simulated images, generated by adding an artificial star drawn from a uniform distribution over the magnitude range and within a 4 ⋅ FWHM square region around the SN position. The different curves correspond to varying tolerances between the recovered flux and the true flux of the input star. A detection is counted as successful if the recovered flux lies within the specified tolerance level of the input artificial star. Right: Same as left panel, but using 1σ detection threshold and 50 000 simulations within a magnitude range of 21.75 to 25.75 mag.