\begin{table}%t3
%\centering
\par
\caption{\label{tab:models-instab}Models of the uncertainty boxes for each metallicity calculated with mass and large separation.}
\small \begin{tabular}{ccccccc}
\hline \hline
\multicolumn{3}{c}{First box}& &\multicolumn{3}{c}{Second box} \\
\feh & $M$ ($M_{\odot}$) & $\Delta\nu$ ($\mu$Hz) & & \feh &
$M$ ($M_{\odot}$) & $\Delta\nu$ ($\mu$Hz)  \\
\hline
\multirow{1}{*}{--0.32} & 1.63 & 53 & &\multirow{1}{*}{--0.32} & 1.63 & 53  \\
 & 1.89 & 37  & & & 1.77 & 44  \\
 & 1.77 & 38  & & & 1.71 & 44  \\
 & 1.51 & 82  & & & 1.58 & 60   \\
 & 1.43 & 71  & & & 1.54 & 58  \\
\multirow{1}{*}{--0.52} & 1.51 & 54  & &\multirow{1}{*}{--0.52} & 1.51 & 54  \\
      & 1.76 & 39  & & & 1.64 & 44  \\
      & 1.62 & 41  & & & 1.58 & 45  \\
      &  1.42 & 74  & & & 1.48 & 60  \\
      &  1.33 & 73  & & & 1.43 & 60  \\
\multirow{1}{*}{--0.12} & 1.76 & 51  & &\multirow{1}{*}{--0.12} & 1.76 & 51  \\
 & 2.05 & 37  & & & 1.92 & 43  \\
 & 1.90 & 39  & & & 1.85 & 43  \\
 & 1.66 & 71  & & & 1.73 & 58  \\
 & 1.55 & 73  & & & 1.67 & 58  \\
\hline
 \end{tabular}
\end{table}