\begin{table}%t4
  \caption{\label{table:8}Cumulative angular density of sources in the narrow energy bands.}
\small%\centerline
 {
\begin{tabular}{c c c c c c c c c}         
\hline\hline                  
Flux &  ${N({>}S)}$ & ${N}$&  ${N({>}S)}$ & ${N}$&  ${N({>}S)}$ & ${N}$&  ${N({>}S)}$ & ${N}$\\
& 0.5--1 keV & & 1--2 keV & & 2--4.5 keV && 4.5--10 keV \\
 (1) & (2) & (3) & (4) & (5) & (6) & (7) & (8) & (9)  \\
\hline
 --15.00  &  417.6 $\pm$ 2.9$^*$  &   20~694  & --              &      --   &  --              &     --   & --              &      --\\
 --14.93 &   363.0 $\pm$ 2.5  &   20~604  &470.7 $\pm$ 3.2$^*$  &   21~185  &  --              &     --   & --              &      --\\
 --14.84 &   315.8 $\pm$ 2.2  &   20~394  &404.4 $\pm$ 2.8  &   21~059  &  --              &     --   & --              &      --\\
 --14.70  &  239.4 $\pm$ 1.7  &   19~429  &300.3 $\pm$ 2.1  &   20~338  &  --              &     --   & --              &      --\\
 --14.43 &   132.9 $\pm$ 1.1  &   14~856  &157.6 $\pm$ 1.2  &   16~004  & 302.4 $\pm$ 3.1$^*$  &    9564 & --              &      --\\
 --14.40  &  122.3 $\pm$ 1.0  &   14~054  &144.5 $\pm$ 1.2  &   15~212  & 272.5$\pm$ 2.8  &    9523 & --              &      --\\
 --14.10  &   56.1 $\pm$ 0.7  &    7291  & 58.2 $\pm$ 0.7  &    7452  & 110.6 $\pm$ 1.2  &    7980 & --              &      --\\
 --14.04  &   46.3 $\pm$ 0.6  &    6071  &47.1 $\pm$ 0.6  &    6125   &  89.6 $\pm$ 1.0  &    7325 & --              &      --\\
 --13.85  &   26.5 $\pm$ 0.4  &    3501  &24.9 $\pm$ 0.4  &    3286   &  46.8 $\pm$ 0.7  &    5022 & 92.2 $\pm$ 2.1$^*$  &    1895\\ 
 --13.80  &   22.8 $\pm$ 0.4  &    3013  & 21.1 $\pm$ 0.4  &    2796  &  39.0 $\pm$ 0.6  &   4407  & 73.8 $\pm$ 1.7  &    1867\\
 --13.50  &    8.9 $\pm$ 0.3  &    1183  &  7.5 $\pm$ 0.2  &     989  &  12.3 $\pm$ 0.3  &   1598  & 22.1 $\pm$ 0.6  &    1432\\
 --13.20  &    3.4 $\pm$ 0.2  &     453  &  2.9 $\pm$ 0.1  &     380  &   4.0 $\pm$ 0.2  &    534  &  6.6 $\pm$ 0.2  &     731\\
 --12.90  &    1.4 $\pm$ 0.1  &     187  &  1.0 $\pm$ 0.1  &     134  &   1.3 $\pm$ 0.1  &    175  &  2.3 $\pm$ 0.1  &     293\\
 --12.60  &    0.6 $\pm$ 0.1  &      73  &  0.4 $\pm$ 0.1  &      55  &   0.5 $\pm$ 0.1  &      66  & 0.7 $\pm$ 0.1  &      89\\
 --12.30  &    0.2 $\pm$ 0.1  &      18  &  0.1 $\pm$ 0.1  &      16  &   0.1 $\pm$ 0.1  &      15  & 0.2 $\pm$ 0.1  &      27\\
\hline                         
\end{tabular}}
\medskip
 (1) Energy band flux in log units.
(2)~Cumulative angular density of sources in units of ${\rm deg^{-2}}$ above given flux in the 0.5$-$1~keV energy band.
(3)~Number of sources above given flux in the 0.5$-$1~keV energy band.
(4)~Cumulative angular density of sources in units of ${\rm deg^{-2}}$ above given flux in the 1$-$2~keV energy band.
(5)~Number of sources above given flux in the 1$-$2~keV energy band.
(6)~Cumulative angular density of sources in units of ${\rm deg^{-2}}$ above given flux in the 2$-$4.5~keV energy band.
(7)~Number of sources above given flux in the 2$-$4.5~keV energy band.
(8)~Cumulative angular density of sources in units of ${\rm deg^{-2}}$ above given flux in the 4.5$-$10~keV energy band.
(9)~Number of sources above given flux in the 4.5$-$10~keV energy band.
$^*$~Cumulative angular density of sources at the flux limit of our survey in the various narrow energy bands.
\end{table}