Fig. 4

image

Flux distribution of the XXL-N point-source population; only good fields are included (observations not flagged in Figs. 5 and 6). The detection_likelihood (LH) is a function of both the number of collected photons and of the background level. Hence, significant LH differences are observed for sources having similar fluxes but detected at different off-axis angles and in different pointings. Cyan diamonds stand for sources detected only in the band in question (limited to LH >15). Crosses indicate sources detected in both bands (allowing for LH < 15 in one band only: red crosses). The 90% completeness level for fluxes is 4 × 10-15 and 2 × 10-14erg s-1 cm-2 in the [0.5−2] and [2−10] keV bands, respectively. Similar behaviour is observed for XXL-S.

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