Detection completeness obtained from averaging the ratio of recovered-to-catalogued artificial sources in random-shoot trials on the OTELO-Deep image as described in text. A spline black curve joins averages over OTELO_Int fluxes in 0.25 mag bins. The dashed line at OTELO_Int=26.38 [AB] corresponds to the 50% completeness magnitude. The histogram traces the false detection rate (FDR) for the OTELO-Deep image, corresponding to an estimate of the spurious from correlated noise.