\begin{table}%ta.6
%\centering
\par
\caption{\label{Tab:mKH2-models}List of 2D merger-motivated models simulated on grids of $1024^2$ and $2048^2$ zones, respectively.}
\vspace*{-2mm}
 \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}{} & $1024^2$ & $2048^2$ & $1024^2$% & $2048^2$
    \\
    \hline
    $\pm 5$ & $\surd$ & &     \\
    $10$ & $\surd$ & $\surd$    \\
    $\pm 10$ & $\surd$ & $\surd$ & $\surd$     \\
    $20$ & $\surd$ &  & $\surd$    \\
    $\pm 20$ & $\surd$ & $\surd$ & $\surd$    \\
    $40$ & & & $\surd$    \\
    $\pm 40$ & & & $\surd$    \\
    \hline
  \end{tabular}
  \vspace*{-1.5mm}
  \tablefoot{Each simulated model
    is indicated by a $\surd$ sign.  The initial shear profile had a
    maximum velocity of $v_0^x = 1.83 \times 10^{9}~$cm/s (i.e., the
    Mach number of the shear flow is $\Mach = 1$), and a width of $a =
    20~$m.  The first column lists the initial field strength,
    marking models with anti-parallel initial fields by a $\pm$
    preceding the numerical value.  Most models were simulated using
    different initial perturbations, and most models were additionally
    simulated on coarser grids.  }
   %\vspace*{3mm}
\end{table}