\begin{table}%[th]%ta1
\caption{\label{tab_calA}Calibration of A.}
\begin{tabular}{cccc}
\hline
\hline\noalign{\medskip}
$v\sin i$ & $\sigma_{{\rm CCF}}$ & $\sqrt{\sigma_{{\rm CCF}}^2-\sigma_{0}^2}$ & $A$\\
{\rm km~s}$^{-1}$ & {\rm km~s}$^{-1}$ & {\rm km~s}$^{-1}$ & \\
\hline
\multicolumn{4}{c}{{\rm FEROS}}\\
%\\
\hline
0 & $4.47 \pm 0.01$ & $\ldots$ & $\ldots$ \\
5 & $5.47 \pm 0.02$ & $3.15 \pm 0.02$ & $1.59 \pm 0.02$\\
10 & $6.85 \pm 0.04$ & $5.15 \pm 0.04$ & $1.96 \pm 0.03$\\
15 & $9.69 \pm 0.07$ & $8.60 \pm 0.08$ & $1.75 \pm 0.05$\\
20 & $11.07 \pm 0.10$ & $10.13 \pm 0.09$ & $1.98 \pm 0.03$\\
25 & $14.01 \pm 0.25$ & $13.28 \pm 0.27$ & $1.88 \pm 0.16$\\
30 & $17.34 \pm 0.44$ & $16.75 \pm 0.48$ & $1.79 \pm 0.30$\\
\hline
\multicolumn{4}{c}{{\rm HARPS}}\\
%\\
\hline
%v\sin i & \sigma_{{\rm CCF}} & \sqrt{\sigma_{{\rm CCF}}^2-\sigma_{0}^2} & A\\
%{\rm km~s}^{-1} & {\rm km~s}^{-1} & {\rm km~s}^{-1} & \\
%\hline
%\\
0 & $3.86 \pm 0.01$ & $\ldots$ & $\ldots$ \\
5 & $4.56 \pm 0.02$ & $2.45 \pm 0.02$  & $2.05 \pm 0.02$\\
10 & $6.54 \pm 0.03$ & $5.28 \pm 0.02$ & $1.89 \pm 0.01$\\
15 & $9.02 \pm 0.07$ & $8.15 \pm 0.06$ & $1.84 \pm 0.05$\\
20 & $11.81 \pm 0.13$ & $11.16 \pm 0.12$ & $1.79 \pm 0.09$\\
25 & $13.85 \pm 0.23$ & $13.30 \pm 0.22$ & $1.88 \pm 0.15$\\
30 & $16.62 \pm 0.39$ & $16.17 \pm 0.37$ & $1.86 \pm 0.33$\\
\hline
 \end{tabular}
\end{table}