\begin{table}%t1
\caption{\label{table1}Time-averaged results for the three MRI runs.  Data is averaged spatially over the entire domain, and temporally over the final two orbits.} 
%\centering
\small                                     
\begin{tabular}{c|ccc|ccc|ccc|ccc}   
\hline \hline                       
%&&&&&&&&&&&& \\[-8pt]
& \multicolumn{3}{c|}{Mass fraction} & \multicolumn{3}{c|}{Volume fraction}
&\multicolumn{3}{c|}{rms velocity [$\kms$]} &
\multicolumn{3}{c}{B [$\mu$G]} \\
\raisebox{1.5ex}[0cm][0cm]{Method}
& H & G & F & H & G & F & H & G & F & H & G & F \\
\hline
ZEUS        & 0.63 & 0.25 & 0.12 &      0.050 & 0.15 & 0.80 &      2.5 & 3.0 & 3.3 &      2.9 & 2.8 & 2.4\\
NIRVANA (Cons)     & 0.54 & 0.32 & 0.14 &      0.039 & 0.16 & 0.80 &      1.7 & 2.2 & 2.4 &      2.2 & 2.0 & 1.6\\
NIRVANA (Non-Cons) & 0.54 & 0.33 & 0.12 &      0.040 & 0.17 & 0.79 &      1.9 & 2.5&2.9 &       2.4 & 2.2 & 1.8\\
\hline
\end{tabular}
\end{table}