\begin{table}%T1
%\centering
\par
\caption{Properties of the X-ray sources in the Serpens cloud.
The source names in the first column consist of the J2000 coordinates.
The \mbox{EPIC-PN} countrates are listed in the second column, followed by
information about optical and near-infrared counterparts and known membership
to the Serpens cloud. The extinction and bolometric luminosity estimates in the
next two columns were generally taken
from Eiroa \& Casali (1992), for 182957.9+011246 (=EC~95) they are based
on the study by Preibisch (1999) and for 182957.7+011052 (=HD 170545)
they were derived as described in the text.
 We then list the extinction-corrected X-ray luminosities in the 
[0.2--10]~keV energy band and the fractional X-ray luminosities.
The countrates for the two objects marked with asterisks have been derived 
from the MOS data
and multiplied by the typical PN/MOS countrate ratio, because these sources
are locate outdied the field-of-view of the PN image or in gaps
between the individual chips.
\label{source_tab} }
\begin{tabular}{lclrrccl}\hline\hline\\[-3.2mm]
  Serpens~J & $CR_{\rm PN}$ & opt/NIR & $A_{V,\rm IR}$ &
$L_{\rm bol}$&$L_{\rm X}$&$\log\frac{L_{\rm X}}{L_{\rm bol}}$ & Identification \\ 
 & [cnts/s] & CP & [mag] &[$L_\odot$]& 
[erg/s]& &  \\[-3.2mm]\\\hline
%
 182904.5+010948&$0.0247\pm 0.0043$&  y/y   &    &     &        &     &\\
 182920.5+010854&$0.0265\pm 0.0035$&  y/y   &    &     &        &     &\\
 182922.8+011032&$0.0433\pm 0.0039$&  y/y   &    &     &        &     &\\
 182926.5+011802&$0.0139\pm 0.0025$& --/--  &    &     &        &     &\\
 182931.3+010548&$0.0118\pm 0.0025$&  y/y   &    &     &        &     &\\
 182933.1+011716&$0.0676\pm 0.0043$&  y/y   &    &     &        &     & SVS~14\\
 182933.5+010700&$0.0210\pm 0.0028$&  y/y   &    &     &        &     &\\
 182934.7+010528&$0.0165\pm 0.0027$&  y/y   &    &     &        &     &\\
 182934.7+010606&$0.0114\pm 0.0024$&  y/y   &    &     &        &     &\\
 182935.1+012338&$0.0318\pm 0.0069^*$& --/y   &    &     &        &     &\\
 182939.7+011754&$0.0080\pm 0.0017$& --/y   &    &     &        &     &\\
 182941.5+010736&$0.0429\pm 0.0057^*$&  y/y   &    &     &        &     &\\
 182947.3+012234&$0.0301\pm 0.0035$&  y/y   &    &     &        &     &\\
 182951.2+011640&$0.0024\pm 0.0010$& --/y  M&  16& 0.90& 1.83e30&--3.27& EC~53 = SMM5  \\
 182953.7+011702&$0.0062\pm 0.0013$&  y/y  M&   2& 0.41& 3.00e29&--3.72& EC~67\\
 182955.3+011034&$0.0145\pm 0.0017$&  y/y   &    &     &        &     &\\
 182955.7+011428&$0.0060\pm 0.0012$& --/y  M&  13& 1.13& 2.87e30&--3.18& EC~74\\
 182955.7+010024&$0.0310\pm 0.0042$&  y/y   &    &     &        &     &\\
 182956.3+011056&$0.0112\pm 0.0016$&  y/y   &    &     &        &     &\\
 182957.5+011448&$0.0062\pm 0.0012$& --/y  M&   2& 0.32& 3.00e29&--3.61& EC~86\\
 182957.7+011052&$0.0186\pm 0.0019$&  y/y  ?& 0.4&  70 & 6.38e29&--5.62& HD 170545\\
 182957.7+011404&$0.0122\pm 0.0016$& --/y  M&  19&57   & 9.32e30&--4.37& EC~90 = SVS~20\\
 182957.9+011246&$0.1466\pm 0.0044$& --/y  M&  36& 60  & 3.70e31&--3.79& EC~95\\
 182957.9+011530&$0.0159\pm 0.0021$& --/y  M&  18& 1.28& 1.21e31&--2.61& EC~93\\
 182958.4+011520&$0.0119\pm 0.0019$&  y/y  M&   8& 1.46& 2.88e30&--3.29& EC~97\\
 182959.3+011408&$0.0231\pm 0.0020$&  y/y  M&   3& 0.94& 1.62e30&--3.35& EC~105\\
 183000.7+011338&$0.0097\pm 0.0014$& --/y  M&   6& 0.66& 1.58e30&--3.21& EC~117\\
 183001.3+011500&$0.0090\pm 0.0014$& --/y  M&    &     &        &     & EC~122  \\
 183003.5+011620&$0.0213\pm 0.0020$&  y/y  M& 0.5& 0.48& 5.00e29&--3.57& EC~135 = GGD~29\\
 183004.7+012232&$0.0111\pm 0.0024$& --/--  &    &     &        &     &\\
 183006.3+010104&$0.0135\pm 0.0031$&  y/y   &    &     &        &     &\\
 183006.4+010616&$0.0065\pm 0.0016$&  y/y   &    &     &        &     &\\
 183006.7+011216&$0.0055\pm 0.0014$& --/y   &    &     &        &     &\\
 183007.7+011204&$0.0282\pm 0.0025$&  y/y   &    &     &        &     &  STGM8   \\
 183008.1+010550&$0.0050\pm 0.0016$&  y/y   &    &     &        &     &\\
 183010.0+012436&$0.0113\pm 0.0029$& --/--  &    &     &        &     &\\
 183018.3+011416&$0.0112\pm 0.0017$&  y/y   &    &     &        &     &\\
 183022.0+012108&$0.0134\pm 0.0027$&  y/y   &    &     &        &     &\\
 183022.4+012044&$0.0163\pm 0.0028$&  y/y   &    &     &        &     &\\
 183023.5+010500&$0.0192\pm 0.0029$&  y/y   &    &     &        &     &\\
 183025.9+010928&$0.0078\pm 0.0017$&  y/y   &    &     &        &     &\\
 183035.5+010552&$0.0108\pm 0.0027$&  y/y   &    &     &        &     &\\
 183037.5+011758&$0.0742\pm 0.0054$&  y/y   &    &     &        &     &\\
 183039.8+011800&$0.0192\pm 0.0032$&  y/y   &    &     &        &     &\\
 183040.2+011020&$0.0068\pm 0.0022$&  y/y   &    &     &        &     &\\\hline
\end{tabular}
\end{table}