\begin{table}%t1
         \caption{MEGNO map codes and Lyapunov time estimates
      for Hyperion.\label{tab1}}
              $$
         \begin{array}{lcc}
            \hline\hline
            \noalign{\smallskip}
            \mbox{Code}      &  Y  & T_{\rm L}~[\mbox{days}] \\
            \noalign{\smallskip}
            \hline
            \noalign{\smallskip}
            \texttt{A} \quad &  Y \leq 1.5 &     \\
            \texttt{B} &  1.5 < Y \leq 1.8 & \\
            \texttt{C} &  1.8 < Y \leq 2.2 & \\
            \texttt{D} &  2.2 < Y \leq 4 & \\
            \texttt{E} & 4 < Y \leq 10 &  T_{\rm L} \geq 1000 \\
            \texttt{F} & 10 < Y \leq 100 &  100 \leq  T_{\rm L} < 1000 \\
            \texttt{G} & 100 < Y \leq 300 &  33 \leq  T_{\rm L} < 100 \\
            \texttt{H} & 300 < Y \leq 500 &  20 \leq  T_{\rm L} < 33 \\
            \texttt{I} &   Y > 500 &     T_{\rm L} < 20 \\
            \noalign{\smallskip}
            \hline
         \end{array}
     $$
   \end{table}