\begin{table}%t1
          %\centering
\par
           \caption{Narrow band filter characteristics and       interferometric coupler splitting ratios as measured in laboratory calibrations.\label{tab:filters}}         	      \begin{tabular}{ccccc}            \hline
            \hline            \noalign{\smallskip}            Filter &~$\lambda_{{\rm c}}$ & 
            {\it FWHM}     & $R$ & $T$\\                   & ($\mu$m)               & ($\mu$m) &   &  \\            \noalign{\smallskip}            \hline            \noalign{\smallskip}	    $K$203 & 2.03 & 0.10 & 0.67 & 0.33 \\	    $K$215 & 2.15 & 0.10 & 0.53 & 0.47 \\	    $K$222 & 2.22 & 0.10 & 0.56 & 0.44 \\	    $K$239 & 2.39 & 0.10 & 0.78 & 0.22 \\	    \noalign{\smallskip}            \hline         \end{tabular}	    \end{table}