\begin{table}%t3
\caption{\label{tabla3}Radial velocity standard stars.}
%\centering
\par
\begin{tabular}{l c c c}
\hline\hline
\noalign{\smallskip}
Star & SpT & $V_{r}\pm\sigma_{V_{r}}$  & Reference \\
     &     &      (km~s$^{-1}$)               &           \\
\hline
HD 102870 & F8V & $4.30$      & a \\
HD 50692 & G0V & $-15.05$     & a \\
HD 84737 & G0.5 & $6.0\pm1.1$ & b \\
HD 20630 & G5V & $18.0\pm1.0$ & b \\
HD 159222 & G5V & $-51.60$    & a \\
HD 82885 & G8III & $14.40$    & a \\
HD 65583  & G8V & $14.80$     & a \\
HD 144579 & G8V & $-59.45$    & a \\
HD 182488 & G8V & $-21.55$    & a \\
HD 102494 & G9IV & $-22.1\pm0.3$ & c \\
HD 62509 &  K0III & $3.2\pm0.3$  & c \\
HD 100696 & K0III & $0.2\pm0.5$  & b \\
HD 3651 &   K0V & $-32.96\pm0.8$ & b \\
HD 38230 &  K0V & $-29.25$      & a \\
HD 136442 & K0V & $-45.6\pm0.8$ & b \\
HD 92588 & K1IV & $43.5\pm0.3$  & d \\
HD 10476 &  K1V & $-33.9\pm0.9$ & b \\
HD 73667 & K1V & $-12.10$       & a \\
HD 124897 & K2III & $-5.3\pm0.3$ & c \\
HD 4628 &   K2V & $-10.1\pm0.4$  & d\\
HD 82106 & K3V & $29.75$   & a \\
HD 139323 & K3V & $-67.20$ & a  \\
HD 29139 & K5III & $54.29\pm0.2$ & c \\
\hline
\end{tabular}
\tablebib {
a) \cite{1999ASPC..185..367U};
b) \cite{1986PASP...98..223B};
c) \cite{1999ASPC..185..383U};
d) \cite{1979PASP...91..698B}.}
\par
\end{table}