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\begin{document}
\small
\begin{tabular}{l|r@{$\,\pm\,\,$}l|r@{$\,\pm\,\,$} l}
                                              &
                                              \multicolumn{4}{c}{Fitted value} \\
\raisebox{1.5ex}[-1.5ex]{Fit parameter}                          &
\multicolumn{2}{c}{2011}  &  \multicolumn{2}{c}{2012}   \\ \hline
$N^{ B\xspace\xspace^0_ s\xspace\xspace\xspace}$                       &    960 & 42 & 2061 & 60  \\
$m_{ B\xspace\xspace^0_ s\xspace\xspace\xspace}$ [ $ {\mathrm{\,Me\kern -0.1em V\!/}c^2}$ \xspace]             &  5365.6  & 1.8  & 5369.6 & 1.3  \\
$\tau_{\textrm{eff}}$ [ps]         &  1.485 & 0.060  & 1.476 & 0.041 \\
$N^{\textrm{comb}} $                           &          1898 & 64   &  3643 & 89      \\
$N^{\textrm{partial}}$                            &         81 & 26  & 345 & 39            \\
$a_{\textrm{comb}}$                              & $-0.37$ & 0.05     &   $-0.31$ & 0.03        \\
$f_{\textrm{comb}}$  &  0.52 & 0.03 & 0.49 & 0.02 \\
$\tau_{\textrm{comb}}$ [ps] &  0.97 & $0.06$ & 0.82 & $0.04$\\
\end{tabular}
\end{document}
