\begin{table}%t1
%\centering
\par
\caption{\label{T1}Observed and inferred stellar parameters of GJ~876.}
\small  \begin{tabular}{l l c c}
\hline\hline \noalign {\smallskip}
\multicolumn{2}{l}{Parameter} &\hspace*{2mm} &   GJ~876 \\
\hline
 Sp & & & M4~V  \\
 $V$ & [mag] & & 10.162 \\
 $\pi$ & [mas] & & $212.69 \pm 2.10$ \\
 $M_V$ & [mag] & & $11.80 \pm 0.05$ \\
 ${\rm [Fe/H]}$ & [dex] & & $0.05 \pm 0.20$ \\
 $L$ & [$L_{\odot}$] & & 0.013 \\
 $M_*$ & [$M_{\odot}$] & & $0.334 \pm 10$\% \\
 $P_{{\rm rot}}$& [day] & & 96.7 \\
 $v\sin{i}$ & [km~s$^{-1}$] & & $0.16$ \\
 age($\log R'_{{\rm HK}}$) & [Gyr] & & 0.1$-$5 \\
 \noalign{\smallskip}\hline
 \end{tabular}
\end{table}