the removal operates on individual sources, 98% of the catalogue entries are in good pointings (only 313 XXL-N and 261 XXL-S sources are in bad pointings ).

The 90% of the coverage is achieved for a flux of 5.8 $10^{-15}$ erg s$^{-1}$ cm$^{-2}$ in the soft band, and of 3.8 $10^{-14}$ erg s$^{-1}$ cm$^{-2}$ in the hard band.

### Source counts\[SecInfo2\]

The $logN-logS$ relation has been calculated (in the two energy bands) as described in , taking into account the numerically calculated probabilities to detect sources with a certain flux, an off-axis distance in a pointing with effective exposure, and a particle background level. The sources in the overlaps between pointings were taken into account according to the Voronoi tessellation technique described in detail in , and only good pointings with exposures below 15 ks were considered in order to have uniformity of coverage. It is shown in Fig. \[FigLogN\] for the entire survey; the curves calculated separately for the XXL-N and XXL-S areas are extremely similar, which indicates no effect of cosmic variance.

We plot representative data from the literature. We show the XMM-LSS data (which are a subset of XXL-N analysed with a previous version of our pipeline, 