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Different tests and simulations were performed to determine,
for each final stacked image, the best parameter set for the
catalogue extraction with SExtractor (Bertin and Arnouts 1996).
The tests were performed with a population of point-like sources with
a given luminosity function (LF). The idea is to determine
1) the completeness limit of the extracted objects and
2) an estimate of the fraction of spurious detections.