\begin{table}%t2
   \caption{The weighted root mean squares of the differences between estimates
            of the Earth rotation model from analysis of VLBI~observations 
            and the USNO Finals EOP~model for the period of~[1996.0, 2006.0]. The statistics in
            rows~1 and~2 correspond to
            solution~B, which follows the proposed approach. The statistics 
            in row~3 correspond to solution~gsf2006c, which follows 
            the traditional approach. }\label{f:erm_dif.tab}
%\centering
\small
   \begin{tabular}{lcccccc}
     \hline \hline
     Solution  & $q_1$        &  $q_2$        &  $q_3$        &  
                 $\dot{q}_1$  &  $\dot{q}_2$  &  $\dot{q}_3$  
     \vphantom{$\bigl($} \\
     \hline
%&&&&&& \\[-8pt]
     ERM all   & $ 0.79$~$\times$ $10^{-9}  $ rad &
                 $ 0.99$~$\times$ $10^{-9}  $ rad &
                 $ 0.64$~$\times$ $10^{-9}  $ rad &
                 $ 0.78$~$\times$ $10^{-14} $ rad~s${}^{-1}$ &
                 $ 1.16$~$\times$ $10^{-14} $ rad~s${}^{-1}$ &
                 $ 0.92$~$\times$ $10^{-14} $ rad~s${}^{-1}$ 
     \\
     ERM exp   & $ 0.58$~$\times$ $10^{-9}  $ rad &
                 $ 0.69$~$\times$ $10^{-9}  $ rad &
                 $ 0.52$~$\times$ $10^{-9}  $ rad &
                 $ 0.77$~$\times$ $10^{-14} $ rad~s${}^{-1}$ &
                 $ 1.15$~$\times$ $10^{-14} $ rad~s${}^{-1}$ &
                 $ 0.81$~$\times$ $10^{-14} $ rad~s${}^{-1}$ 
     \\
     gsf2006c  & $ 0.55$~$\times$ $10^{-9}  $ rad &
                 $ 0.57$~$\times$ $10^{-9}  $ rad &
                 $ 0.42$~$\times$ $10^{-9}  $ rad &
                 $ 1.89$~$\times$ $10^{-14} $ rad~s${}^{-1}$ &
                 $ 2.00$~$\times$ $10^{-14} $ rad~s${}^{-1}$ &
                 $ 1.52$~$\times$ $10^{-14} $ rad~s${}^{-1}$ 
     \\
     \hline
   \end{tabular}
\end{table}