**Table 1:** Summary of the source detection results.
Energy band	$N_{{\rm tot}}$	$N_{{\rm sel}}$	$f_{{\rm ext}}$	$S_{\rm min}/S_{\rm med}$	${\rm cts_{min}/cts_{med}}$	${N({>}S_{\rm min})}$
(keV)			(%)	${\rm (10^{-15}~cgs)}$		${\rm deg^{-2}}$
(1)	(2)	(3)	(4)	(5)	(6)	(7)
0.5-1	21 311	20 694	3.6	1.0/5.7	11/42	$417.6\pm2.9$
1-2	21 848	21 185	2.4	1.2/6.0	10/40	$470.7\pm3.2$
2-4.5	9926	9564	1.0	3.7/15	12/38	$302.4\pm3.1$
4.5-10	1973	1895	0.2	14.0/50	15/46	$92.2\pm2.1$
0.5-2	32 665	31 837	3.0	1.4/8.4	13/56	$605.7\pm3.4$
2-10	9702	9431	0.7	9.0/35	17/57	$315.6\pm3.2$

(1) Energy band definition (in keV). (2) Total number of sources detected in the band with a significance of detection $\mathcal{L}$ $\ge$ 15 (after excluding the targets of the observations, see Sect. 2.3). (3) Final number of sources selected to compute the source count distributions (see Sects. 2.3 and 2.5 for details). (4) Fraction of sources in the sample detected as extended in X-rays. (5) Minimum and median flux of the sources selected to compute the source count distributions. (6) Minimum and median of the distribution of total pn counts in the band (background subtracted) of the sources selected to compute the source count distributions. Note that the minimum number of counts correspond to a small fraction of sources in the samples. More than 92% of the sources have at least 20 counts in the 0.5-1 keV, 1-2 keV and 2-4.5 keV bands and this fraction increases to more than 98% in the 0.5-2 keV, 2-10 keV and 4.5-10 keV energy bands. (7) Cumulative sky density of sources in the various energy bands at the flux limits of our survey.

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