\begin{table}%t1
\caption{\label{tab1}Positions of the \mbox{X-ray} sources in the field of ACIS-I as labeled in Fig.~\ref{fig2}. The corresponding $1\sigma$ positional errors, signal-to-noise ratios as well as the estimates of source extent are also tabulated.} 
%\centerline
 {\small 
\begin{tabular}{l c c c c c c }
\hline\hline\noalign{\smallskip}
Source & RA (J2000) &  Dec (J2000)  & $\delta$~RA & $\delta$~Dec & $S/N^{a}$ & PSFRATIO$^{b}$ \\
\hline
& h:m:s &   d:m:s       & arcsec      & arcsec & $\sigma_{G}$ & \\
\hline
1 & 19:54:57.172  & +31:28:36.59   & 0.30    & 0.22 & 13.02 & 1.08  \\
2 & 19:54:53.728  & +31:32:12.81  &  0.43    & 0.20 & 14.26 & 1.47  \\
3 & 19:54:52.507  & +31:24:33.74  &  0.70    & 0.28 & 4.71 & 0.80 \\
4 & 19:54:46.466  & +31:31:26.13  &  0.36    & 0.47 & 6.88 & 2.38  \\
5 & 19:54:40.352  & +31:23:11.84  &  0.25    & 0.26 & 10.26 & 0.75 \\
6 & 19:54:37.457  & +31:32:56.14  &  0.54    & 0.33 & 4.71 & 2.19 \\
7 & 19:54:35.356  & +31:23:49.09  &  0.29    & 0.19 & 9.74 & 0.83 \\
8 & 19:54:28.210  & +31:32:37.34  &  0.31    & 0.32 & 5.82 & 2.76 \\ 
9 & 19:54:24.920  & +31:30:04.42  &  0.24    & 0.16 & 10.87 & 5.02 \\
10& 19:54:24.745  & +31:28:24.96  &  0.67    & 0.40 & 3.56 & 9.29 \\
11& 19:54:22.965  & +31:29:02.08  &  0.14    & 0.17 & 21.18 & 6.13 \\
12& 19:54:21.016  & +31:33:33.80  &  0.13    & 0.12 & 24.81 & 1.35 \\
13& 19:54:16.717  & +31:32:11.63  &  0.33    & 0.28 & 6.12 & 2.15 \\
14& 19:54:12.784  & +31:24:30.48  &  0.37    & 0.52 & 8.36 & 1.78 \\
15& 19:54:10.148  & +31:30:01.07  &  0.51    & 0.37 & 2.67 & 1.99  \\
16& 19:54:09.741  & +31:24:11.62  &  0.20    & 0.39 & 3.45 & 0.47 \\
17& 19:54:02.592  & +31:27:46.74  &  0.27    & 0.34 & 4.59 & 1.03 \\
18& 19:54:00.649  & +31:23:28.01  &  0.26    & 0.34 & 16.53 & 0.95  \\
19& 19:53:58.504  & +31:26:19.25  &  0.35    & 0.50 & 9.68 & 1.31 \\
20& 19:53:52.939  & +31:25:13.26  &  0.28    & 0.40 & 15.18 & 0.90 \\
21& 19:53:52.315  & +31:27:08.97  &  0.34    & 0.40 & 13.01 & 1.22 \\
22& 19:55:07.125  & +31:30:03.42  &  0.85    & 0.70 & 2.89 & 0.81 \\
23& 19:55:03.136  & +31:26:12.22  &  0.82    & 0.51 & 3.28 & 0.96 \\
24& 19:54:57.325  & +31:28:09.59  &  0.55    & 0.37 & 6.97 & 1.36 \\
25& 19:54:49.830  & +31:26:45.24  &  0.61    & 0.38 & 3.19 & 1.20 \\
26& 19:54:30.035  & +31:31:52.60  &  0.73    & 0.44 & 4.22 & 5.44 \\
27& 19:54:20.292  & +31:21:33.27  &  0.53    & 0.54 & 4.96 & 0.85 \\
28& 19:54:19.929  & +31:22:50.35  &  0.66    & 0.36 & 4.88 & 1.28 \\
29& 19:54:06.334  & +31:27:18.46  &  0.42    & 0.43 & 4.03 & 1.68 \\
30& 19:53:58.555  & +31:31:33.96  &  0.45    & 0.60 & 4.12 & 1.19 \\
31& 19:53:58.106  & +31:32:01.81  &  0.53    & 0.40 & 4.25 & 1.09 \\
32& 19:53:53.202  & +31:24:43.93  &  0.60    & 0.57 & 4.45 & 0.68 \\
33& 19:53:47.918  & +31:28:22.49  &  0.81    & 0.60 & 3.66 & 1.12 \\
34& 19:55:03.855  & +31:29:04.65  &  0.54    & 0.63 & 4.10 & 0.90 \\
35& 19:54:29.821  & +31:28:34.14  &  0.67    & 0.49 & 3.78 & 10.81 \\
36& 19:54:15.732  & +31:33:27.84  &  0.50    & 0.42 & 4.38 & 1.56 \\
\hline
\end{tabular}}
\smallskip
$^{a}$~Estimates of source significance in units of Gehrels error: $\sigma_{G} = 1 + \sqrt{C_{B}+0.75}$ where  $C_{B}$ is the background counts; $^{b}$~the ratios between the source extents and the estimates of the PSF~sizes.
 \end{table}