\begin{table}%t1
%\centering
\par
 {\caption{\label{table:1}Parameters of the numerical models.}
\begin{tabular}{lccc}
  \hline\hline
  $\sigma_0$ & 0 &1 & 3\\
  \hline
  Thin shell ($\xi = 1.1$) & $\surd$ & $\surd$ & \\
  Thick shell ($\xi = 0.5$) & $\surd$ & $\surd$ & \\
  Continuous flow & & $\surd$ & $\surd$\\
  \hline
\end{tabular}
}
\end{table}