\begin{table}%t4
\caption{\label{tab4}Standard stars observed at SSO.}
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\par
\begin{tabular}{lcl}
\hline\hline
 star &  rms   &   reference  \\
      & (mags) &              \\
\hline
\object{HR 3454}, $\eta$ Hya   &  0.024  &   Hamuy et~al. (\cite{Hamuy92}, \cite{Hamuy94})  \\
\object{HR 718}, $\xi^2$ Cet   &  0.027  &   Hamuy et~al. (\cite{Hamuy92}, \cite{Hamuy94})  \\
\object{Feige 110}             &  0.043  &   Oke (\cite{Oke}), Hamuy et~al.  \\
                               &         &    (\cite{Hamuy92}, \cite{Hamuy94}) \\
\object{HR 4468}, $\theta$ Crt &  0.031  &   Hamuy et~al. (\cite{Hamuy92}, \cite{Hamuy94})  \\
\object{HR 1544}, $\pi^2$ Ori  &  0.024  &   Hamuy et~al. (\cite{Hamuy92}, \cite{Hamuy94})  \\
\hline
\end{tabular}
\end{table}