\begin{table}%ta.7
%\centering
\par
\caption{\label{Tab:mKH3-models}Same as \tabref{Tab:mKH2-models} but for the 3D
   merger-motivated models simulated on grids of $128^3$ and $256^3$
   zones, respectively.}
  \vspace*{-1.5mm} 
 \tiny \begin{tabular}{rcccc}
    \hline\hline \noalign{\smallskip}
\multicolumn{1}{c}{$b_0^x$ [$10^{13}$~G]} & \multicolumn{2}{c}{$\Mach = 1$} 
    & \multicolumn{2}{c}{$\Mach = 4$}  \\
    \multicolumn{1}{c}{} & $128^3$ & $256^3$ & $128^3$ & $256^3$
    \\
    \hline
    $5$ & $\surd$ & $\surd$
    \\
    $\pm 5$ & $\surd$ & $\surd$
    \\
    $10$ & $\surd$ & $\surd$ & $\surd$ & $\surd$
    \\
    $\pm 10$ & $\surd$ & $\surd$ & $\surd$ & $\surd$
    \\
    $20$ & $\surd$ & $\surd$ & $\surd$ & $\surd$
    \\
    $\pm 20$ & $\surd$ & $\surd$ & $\surd$ & $\surd$
    \\
    $40$ &         & $\surd$ & $\surd$ & $\surd$
    \\
    $\pm 40$ &         & $\surd$ & $\surd$ & $\surd$
    \\
    \hline
\end{tabular}\vspace{9mm}
  \end{table}