compare Table \[TabCat\] and Appendix \[SecCompLSS\]) reported by , plotted as red diamonds. We also plot earlier data shown in the latter paper: a green solid line for the fit from XMDS , and results from two independent surveys, COSMOS [violet star data points, @2007ApJS..172..341C] and 2XMM . Among the more recent publications we show data from *NuSTAR* [blue dotted line, for the hard band only, rescaled from 3-8 keV, @2016ApJ...831..185H], Stripe82 [observed by XMM, green squares, @2016ApJ...817..172L], and *Chandra* CDFS 7Ms [blue triangles, @2017ApJS..228....2L]. The hard-band points for CDFS were rescaled[^5] from 2-7 keV. Our $logN-logS$ is consistent with the result of earlier surveys, with COSMOS being the most deviant. The slight difference with in the hard band could be due to the different pipeline version or to the lower average exposure of the entire XXL versus the XMM-LSS pointings.

Multiwavelength material \[SecMW\]
==================================

For the purpose of identifying the X-ray detections at other wavelengths, we use optical, near-IR (NIR), IR, and UV photometric data as described in Tables 3 and 4 of , to which the reader is referred in particular for details about the limiting magnitudes in the various bands, and for the data archives used. In 