\begin{table}%Tc2 
\caption{\label{fieldcontenttab}Target / field content classification. }
\small
%\centering
\par
\begin{tabular}{cp{5.8cm}l}
\hline \hline
Class & Description & Percentage \\
\hline
p & point or point-like source & 50\% \\
s & small extended ($r < 3\arcmin $) & 10\%  \\
l & large extended ($r > 3\arcmin $) & 22\% \\
e & extended source of unknown extent &  \phantom{0}0.7\% \\
f & ``field'' (all detections are potential targets) &  12\% \\
x & ``\mbox{X-ray} shadow experiment'' and similar, that is, only the spectra of
     fore- and background objects are of interest (though the location of the
     field should be considered as ``target'') & \phantom{0}2.5\% \\
t & two clearly identified targets (e.g., a double star) & \phantom{0}0.4\% \\
n & there is no target associated with the field & \phantom{0}0.2\% \\
u & unknown target, i.e., the target could not be classified or is of unknown
nature  & \phantom{0}2\% \\ 
\hline
\end{tabular}  		
\end{table}