\begin{table}%t2
\caption{\label{tab2}Range of $D_{\rm 2d}$ and $D_{\rm 3d}$ values, depending on the criterion used.
$100\%$ of UnVos are considered.}                
%\centering
\par
\begin{tabular}{c c c c}        
\hline\hline               
Extrapolation & Fractal & Used & Range of   \\    
Method & Dimension & criterion  & values  \\   
\hline                     
Potential  & $D_{\rm 2d}$ & $B_{\rm cr}$    & $1.57\pm 0.43$ \\
Potential   &   $D_{\rm 3d}$ & $G_{\rm av}$     & $2.331\pm 0.331$ \\
NLFF with preprocessing &  $D_{\rm 2d}$ & $B_{\rm cr}$     & $1.64\pm 0.34$ \\
NLFF with preprocessing   &   $D_{\rm 3d}$ & $G_{\rm av}$     & $2.66\pm 0.21$ \\
NLFF with preprocessing   &   $D_{\rm 3d}$ & $C_{n}$    & $2.75\pm 0.19$ \\
\hline                                   
\end{tabular}
\end{table}