\begin{table}%t1
\caption{\label{tbl_test_models}List of numerical test models.}
\small
%\centering
\par
\begin{tabular}{l l l l l l}
\hline\hline
Name & Grid size & Resolution &~$t_{\rm end}$ &~$t_{\rm coll}$ & Description \\
\hline
ADO  & [0,~50] $\times$ [6,~100]   & 200 $\times$ 400  & 50.0 & --   & 
model of \citet{VTS00}, \citet{GVT06} and \citet{MTV08} \\
%\hline
\multicolumn{6}{c}{Models to test the influence of different 
truncation field lines} \\
%\hline
FL1  & [0,~50] $\times$ [6,~100]   & 200 $\times$ 400  & 8.8  & 5.7  & 
$\alpha_{\rm trunc} = 0.4$, constant values in external region 
(analytical values at $[R_{\rm max},Z_{\rm max}]$) \\
FL2  & [0,~50] $\times$ [6,~100]   & 200 $\times$ 400  & 7.3  & 6.7  & 
$\alpha_{\rm trunc} = 0.8$, constant values in external region 
(analytical values at $[R_{\rm max},Z_{\rm max}]$) \\
FL3  & [0,~50] $\times$ [6,~100]   & 200 $\times$ 400  & 10.0 & 8.1  & 
$\alpha_{\rm trunc} = 5.$, constant values in external region 
(analytical values at $[R_{\rm max},Z_{\rm max}]$) \\
%\hline
\multicolumn{6}{c}{Models to test the influence of the computational 
domain} \\
%\hline
CD1  & [0,~50] $\times$ [6,~100]   & 200 $\times$ 400  & 6.3  & 2.7  & 
$\alpha_{\rm trunc} = 0.4$, in external region damping of $\rho$ and 
$v_z$ with $\alpha_{\rm trunc}/\alpha$ \\
CD2  & [0,~100] $\times$ [6,~200]  & 200 $\times$ 400  & 8.9  & 3.8  & 
same as CD1, but with larger domain (lower resolution, same grid size) \\
CD3  & [0,~100] $\times$ [6,~200]  & 400 $\times$ 800  & 8.1  & 4.1  & 
same as CD1, but with larger domain (same resolution) \\
CD4  & [0,~200] $\times$ [6,~400]  & 400 $\times$ 800  & 9.8  & 6.9  & 
same as CD2, but with even larger domain \\
CD5  & [0,~400] $\times$ [6,~100]  & 1600 $\times$ 400 & 4.7  & 4.5  & 
same as CD1, but with eight times larger domain in $R$ direction, same res. \\
%\hline
\multicolumn{6}{c}{Models to test different initializations of the 
external region} \\
%\hline
ER1  & [0,~50] $\times$ [6,~100]   & 200 $\times$ 400  & 50.0 & 24.9 & 
$\alpha_{\rm trunc} = 0.4$, in external region damping of $v_z$ to 
constant value \\ & & & & & (10\% of the value at the truncation field line) \\
ER2  & [0,~50] $\times$ [6,~100]   & 200 $\times$ 400  & 3.6  & --   & 
$\alpha_{\rm trunc} = 0.4$, in external region damping of all variables 
with $\exp~ [- (\alpha/\alpha_{\rm trunc})^2 ]$ \\
\hline
\end{tabular}
\end{table}