\begin{table}%t1[htbp]
  %\centering
\par
  \caption{Overview of the simulated models: the columns give from
           left to right the name of the model, the type of the
           initial field configuration, the adiabatic index $\gamma$,
           the beam speed $v_{\rm b}$, the proper beam Mach number ${\cal
           M}_{\rm b}$, the average magnetization parameter $\bar{\beta}$,
           and the ratio of the magnetic energy density and the rest
           mass density $\sigma$.}
  \label{tab:model.parameters}
  \begin{tabular}{llrrrrr}  \hline \hline \\ 
    Model & Field & $\gamma$ & $v_{\rm b}$ & $\mathcal{M}_{\rm b}$ & $\bar{\beta}$
    & $\sigma$ \\
    \hline  \\
    C2--0     & none & 5/3 & 0.99 & 41.95 & 0    & 0      \\
    C2--1/20  & tor  & 5/3 & 0.99 & 41.95 & 1/20 & 0.0017 \\
%    C2--1/2   & tor  & 5/3 & 0.99 & 41.95 & 1/2  & 0.0171 \\
    C2--1     & tor  & 5/3 & 0.99 & 41.95 & 1    & 0.0341 \\
    C2--10/3  & tor  & 5/3 & 0.99 & 41.95 & 10/3 & 0.1135 \\
    C2--pol-1 & pol  & 5/3 & 0.99 & 41.95 & 1    & 0.0341 \\
   \hline \\
    B1--0     & none & 4/3 & 0.99 & 41.95 & 0    & 0      \\
    B1--1/20  & tor  & 4/3 & 0.99 & 41.95 & 1/20 & 0.0022 \\
%    B1--1/2   & tor  & 4/3 & 0.99 & 41.95 & 1/2  & 0.0222 \\
    B1--1     & tor  & 4/3 & 0.99 & 41.95 & 1    & 0.0445 \\
    B1--10/3  & tor  & 4/3 & 0.99 & 41.95 & 10/3 & 0.1482 \\
    B1--pol-1 & pol  & 4/3 & 0.99 & 41.95 & 1    & 0.0445 \\
   \hline \\
    C1--0     & none & 5/3 & 0.9  & 13.61 & 0    & 0      \\
    C1--1     & tor  & 5/3 & 0.9  & 13.61 & 1    & 0.0279 \\
    C1--10/3  & tor  & 5/3 & 0.9  & 13.61 & 10/3 & 0.0931 \\
    C1--pol-1 & pol  & 5/3 & 0.9  & 13.61 & 1    & 0.0279 \\
    \hline
  \end{tabular}
\end{table}