\begin{table}%t1
   %\centering
\caption{\label{positionoffsets}Average angular offsets between the peak 
     and the optical counterpart.}\small
   \begin{tabular}{lcc}
      \hline 
   \hline 
         class & number & average  \\
         & of peaks & offset [ \myarcsecnodot] \\
      \hline 
      1 &  3 & $53\pm38$  \\
   2 & 14 & $59\pm24$  \\
   3 & 21 & $51\pm16$  \\
   4 & 34 & $55\pm30$  \\
   5 & 43 & $62\pm32$  \\
   6 & 43 & N/A  \\
   \hline 
   \end{tabular}
   \end{table}