\begin{table} %t2
\caption{\label{tab:opdc}OPD controller state transition table (adapted from \citealt{Bouquin2008}).}
\small 
%\centering
\par
\begin{tabular}{r r | c c c } 
\hline\hline  
		& Next 			& SEARCH 							& IDLE 							& TRACK  \\
current 		&   				&  									&  								&   \\ 
\hline 
SEARCH 		& 				& ${\it SNR} < {\rm det}$ 				& - 								& ${\it SNR} > {\rm det}$  \\ 
IDLE  		& 				& ${\it SNR} < {\rm close}$ 				&  	${\it SNR} < {\rm close}$			& ${\it SNR} > {\rm close}$  \\ 
			&				& for 20 ms							&								& \\
TRACK 		& 				& --  									& ${\it SNR} < {\rm open}$ 			& ${\it SNR} > {\rm open}$ \\ 
	\hline  
\end{tabular} 
\end{table}