\begin{table}%T1
\caption{\label{table1}\label{tab1}Fraction of unstable and cold gas as a function of the shear.} 
\small     
%\centering
\par
\begin{tabular}{c c c c }         
\hline
\hline\noalign{\smallskip} 
         & Cold           & Cold  & Mean value of              \\
         & + Unstable gas &       & the shear (Myr$^{-1}$)             \\
\hline 
$\epsilon=1$     &          0.570           &    0.121  & 12.4   \\ 
$\epsilon=2$     &          0.569           &    0.039  & 15.0  \\ 
$\epsilon=4$     &          0.358           &    0.002  & 23.4  \\
\hline 
\end{tabular}
\end{table}