\begin{table}%t4
\caption{Mean values of the derived atmospheric parameters and abundances for the
dwarf stars as determined
from Methods 1 and 2 ($\langle\rangle$). Blanks indicate that the equivalent widths could not be reliably measured.}
\label{tab_4}
%\begin{center}
\par
\begin{tabular}{lrrrrrrrrrr} \hline\hline
 & \multicolumn{4}{c}{\object{HD 10780} } \vline&
 \multicolumn{4}{c}{\object{HD 4628} }\vline& \multicolumn{2}{c}{\object{HD 201091} ({61 Cyg})}\\
 & \multicolumn{2}{c}{Method 1} & \multicolumn{2}{c}{Method 2} \vline&
 \multicolumn{2}{c}{Method 1} & \multicolumn{2}{c}{Method 2}\vline &
 \multicolumn{2}{c}{Method 1$^b$}  \\
& \multicolumn{1}{c}{$N$} & \multicolumn{1}{c}{$\langle\rangle$} & \multicolumn{1}{c}{$N$} & \multicolumn{1}{c}{$\langle\rangle$} \vline& \multicolumn{1}{c}{$N$} & \multicolumn{1}{c}{$\langle\rangle$} & \multicolumn{1}{c}{{\em N}} & \multicolumn{1}{c}{$\langle\rangle$}\vline & \multicolumn{1}{c}{{\em N}} & \multicolumn{1}{c}{$\langle\rangle$}  \\\hline 
$T_{\rm eff}$ (K)     &   &   $5300\pm95$  &   & $5125\pm158$    &&$5080\pm130$    &   & $4876\pm150$     &   & $4525\pm140$      \\
log $g$ (cm s$^{-2}$) &   &  $4.13\pm0.23$  &   & $3.79\pm0.35$   &   & $4.59\pm0.26$   &   &  $4.12\pm0.28$   &   &  $4.65\pm0.25$   \\
$\xi$ (km s$^{-1}$)   &   &  $1.17\pm0.29$  &   & $1.41\pm0.32$   &   & $1.06\pm0.24$   &   &  $1.36\pm0.31$   &   &  $1.34\pm0.24$   \\
$v\sin i$ (km s$^{-1}$) &&&&  0.6 $^a$&&&& 1.7 && 1.1\\
${\rm [Fe/H]}$        &25 & $-0.10\pm0.10$ &22 & $-0.22\pm0.14$ &36&$-0.30\pm0.15$ &32 &  $-0.42\pm0.18$ &26 &  $-0.37\pm0.19$ \\
${\rm [O/Fe]}$       &3  &   $0.13\pm0.09$ &3  &  $0.34\pm0.12$ &2  &    $0.27\pm0.23$ &2  &    $0.51\pm0.22$ &  &    \\
${\rm [Na/Fe]}$   &   &                  &   &                   &1  &    $0.04\pm0.06$ &1  &    $0.05\pm0.08$ &1  &    $0.10\pm0.06$ \\
${\rm [Mg/Fe]}$   &   &                  &   &                   &1  &  $0.31\pm0.04$ &1  &  $0.42\pm0.02$ &1  & $0.02\pm0.04$ \\
${\rm [Al/Fe]}$       &   &              &  &                   &2  &    $0.26\pm0.07$ &2  &    $0.21\pm0.06$ &2  &    $0.10\pm0.11$ \\
${\rm [Si/Fe]}$       &3  &   $-0.01\pm0.07$  &7  &   $0.05\pm0.10$ &5  &   $0.02\pm0.15$ &5  &    $0.13\pm0.15$ &3  &    $0.07\pm0.12$ \\
${\rm [Ca/Fe]}$   &1  &   $0.08\pm0.12$ &1  &   $0.03\pm0.26$ &3  &    $0.05\pm0.10$ &3  &    $0.03\pm0.18$ &3  &    $0.05\pm0.10$ \\
${\rm [Sc/Fe]}$       &   &                 &   &            &    &            &    &    &  &      \\
${\rm [Ti/Fe]}$       &1  & $-0.02\pm0.07$ &1  & $-0.03\pm0.12$ &1  & $-0.06\pm0.11$ &1  &  $0.03\pm0.13$ &1  &  $0.12\pm0.11$ \\
${\rm [Cr/Fe]}$       &1  &   $0.08\pm0.10$ &1  &   $0.04\pm0.15$ &2  &   $0.03\pm0.10$ &2  &   $-0.02\pm0.18$ &2  &  $0.20\pm0.10$ \\
${\rm [Co/Fe]}$       &1  &   $0.03\pm0.08$ &1  &   $0.01\pm0.12$ &1  &   $0.03\pm0.09$ &1  &  $-0.01\pm0.12$ &  &     \\
${\rm [Ni/Fe]}$       &3 &    $0.00\pm0.11$ &3 & $-0.02\pm0.15$ &4 &$-0.06\pm0.12$ &4 & $-0.05\pm0.16$ &5  & $-0.10\pm0.12$ \\
${\rm [Ba/Fe]}$       &   &                 &   &             &1  &  $-0.25\pm0.31$ &1  &  $-0.49\pm0.44$ &1  &  $-0.35\pm0.30$ \\
${\rm [\alpha/Fe]}$ && $0.02\pm0.05$ &&&& $0.08\pm0.05$ &&&& $0.04\pm0.05$ \\\hline
&&&&&&&&&&\\
\end{tabular}
\begin{flushleft}
$^a$:  From Fekel (\cite{Fekel1997}).\\
$^b$:  Although the approach adopted for the analysis of
{61~Cyg~A} (described in Sect.~\ref{sect_abondance}) is completely different from the first
one, we maintain the notation "Method~1''. We consider the atmospheric parameters ($T_{\rm eff}$ and $\xi$) obtained
in this way, together with the temperature derived from the $B-V$
index, which is metallicity-sensitive,
as approximate estimates.\\
\end{flushleft}
%\end{center}
\par
\end{table}