\begin{table}%t2
%\centering
\par
\caption{\label{thick_exps}HV ice-segregation experiments.}            
\small      
\begin{tabular}{l c c c c  }       
\hline\hline                
Exp. &H$_2$O:CO$_2$ &Thick. (ML) & $T_{\rm dep}$ (K) &$T_{\rm exp}$ (K) \\
\hline                 
I &4:1 &430 &15 &60\\  
II &4:1 &510 &15 &70\\ 
III &2:1 &140 &15 &40 \\ 
IV &2:1 &160 &15 &45 \\  
V &2:1 &240 &15 &50 \\  
VI &2:1 &160 &15 &60 \\ 
VII &2:1 &180 &15 &70 \\
\hline
\end{tabular}
\end{table}