Table 1: Summary of surveys.
    Soft (0.5-2 keV)  
Survey Flux limit (erg cm-2 s-1) Area (deg2) $N_{\rm total}$a $N_{\rm AGN}$b

RBS		 $2.5 \times10^{-12}$ 20 300 953 (100%) 310
RIXOS8 $8.4 \times10^{-14}$ 4.44 105 (100%) 40
RIXOS3 $3.0 \times10^{-14}$ 15.77 296 (94%) 182
XMS  $1.5 \times10^{-14}$ 3.33 210 (96%) 178
UDS $1.2 \times10^{-15}$ 0.36 94 (95%)c 73c
CDF-S $5.5 \times10^{-17}$ 0.12 307 (99%)c 226c
    Hard (2-10 keV)  
Survey Flux limit (erg cm-2 s-1) Area (deg2) $N_{\rm total}$a $N_{\rm AGN}$b

AMSS		 $3.0 \times10^{-13}$ 68 87 (99%) 79
XMS  $3.3 \times10^{-14}$ 3.33 159 (84%) 120
CDF-S $4.5 \times10^{-16}$ 0.11 251 (99%)c 236c
    Ultrahard (4.5-7.5 keV)  
Survey Flux limit (erg cm-2 s-1) Area (deg2) $N_{\rm total}$a $N_{\rm AGN}$b
HBSS $7.0 \times10^{-14}$ 25.17 67 (97%) 62
XMS  $6.8 \times10^{-15}$ 3.33 70 (86%) 57
a Total number of X-ray sources in the sample (identification completeness in parenthesis).
b Number of identified AGN in the sample.
c Including photometric redshifts (see text).


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