\begin{table}%t1
%\centering
\par
\caption{\label{tab:1}Strong scaling behavior of a M~dwarf model test case for different configurations and total number of processors used. (See text for details).}
\small  \begin{tabular}{rrrrrrrrrrr}
\hline\hline\noalign{\smallskip}
&   &  &    Timing: &  &   &    &    &   Scaling: &   &            \\
\hline
$n$(MPI) & Cluster size & $n$(cluster) & Line opacity &  3DRT &       Comm &      Total &            & Line opacity &       3DRT &      Total \\
      2048 &        512 &          4 &       2473 &       9942 &        436 &      12~909 &            &     96.7\% &     79.3\% &     81.9\% \\
      2048 &        256 &          8 &       2414 &       8054 &        285 &      10~789 &            &     99.1\% &     97.9\% &     98.0\% \\
      1024 &        512 &          2 &       4900 &      20~103 &        754 &      25~872 &            &     97.6\% &     78.4\% &     81.7\% \\
      1024 &        256 &          4 &       4741 &      15~966 &        604 &      21~385 &            &    100.9\% &     98.7\% &     98.9\% \\
      1024 &        128 &          8 &       4681 &      14~275 &        471 &      19~483 &            &    102.2\% &    110.4\% &    108.6\% \\
       512 &        512 &          1 &       9780 &      39~793 &       1539 &      51~341 &            &     97.8\% &     79.2\% &     82.4\% \\
       512 &        256 &          2 &       9566 &      31~524 &       1061 &      42~300 &            &    100.0\% &    100.0\% &    100.0\% \\
\noalign{\smallskip}\hline\noalign{\smallskip}
\end{tabular}
\vspace*{4mm}  
\end{table}