\begin{table}%t3
\caption{Average abundances $a$ of F and G stars with solar metallicity 
($\left\vert\Delta\rm[Fe/H]\right\vert<0.05$) and of young stars (age 
$\le$$1$~Gyr) from the solar neighbourhood. $\sigma_{\rm abd}$ is the
accuracy of the abundance determinations from stellar spectra, $\sigma_{*}$~is
the scattering of the stellar abundances around the mean. $Z$~is the metallicity
calculated from these abundances.}\label{TabElAbBen05}
\small%\centerline
 {
\begin{tabular}{rll|cccccc|ccc}
\hline\hline
 & &  & 
 \multicolumn{6}{c|}{Nearby F \& G stars}&
 \multicolumn{3}{c}{B dwarfs} \\
 & & & \multicolumn{3}{c}{solar met.} & \multicolumn{2}{c}{age $<$$1$ Gyr} &
& & & \\
Z  &\multicolumn{2}{c|}{Element} & $a$ & $\sigma_{\rm abd}$ & $\sigma_{*}$ 
& $a$ & $\sigma_{*}$ & Source & $a$ & $\sigma_{*}$ & Source   \\
\hline
 2 &      & He &       &      &      &      &      &   & 11.02 & 0.05 & 3  \\
 6 &  & C  &  8.37 & 0.06 & 0.11 & 8.39 & 0.11 & 2 & 8.32  & 0.10 & 4  \\
 7 &      & N  &       &      &      &      &      &   & 7.73  & 0.28 & 5  \\
 8 &      & O  &  8.75 &      & 0.07 & 8.77 & 0.13 & 1 & 8.63  & 0.18 & 4  \\
10 &      & Ne &       &      &      &      &      &   & 8.11  & 0.04 & 6  \\
11 &      & Na &  6.30 & 0.03 & 0.16 & 6.27 & 0.10 & 1 & & & \\
12 &      & Mg &  7.63 & 0.06 & 0.32 & 7.64 & 0.21 & 1 & 7.59  & 0.15 & 7  \\
13 &      & Al &  6.52 & 0.05 & 0.24 & 6.54 & 0.22 & 1 & 6.24  & 0.14 & 5  \\
14 &      & Si &  7.60 & 0.05 & 0.28 & 7.61 & 0.23 & 1 & 7.50  & 0.21 & 5  \\
16 &      & S  &  7.17 & 0.16 &      & 7.29 & 0.10 &   & 7.22  & 0.10 & 4  \\
18 &      & Ar &       &      &      &      &      &   & 6.48  & 0.04 & 8  \\
20 &      & Ca &  6.42 & 0.03 & 0.37 & 6.48 & 0.39 & 1 & & & \\
22 &      & Ti &  4.92 & 0.03 & 0.11 & 4.94 & 0.14 & 1 & & & \\
24 &      & Cr &  5.66 & 0.02 & 0.13 & 5.73 & 0.28 & 1 & & & \\
26 &      & Fe &  7.55 & 0.06 & 0.12 & 7.61 & 0.25 & 1 & 7.46  & 0.08 & 9  \\
28 &      & Ni &  6.22 & 0.02 & 0.09 & 6.25 & 0.07 & 1 & & & \\
30 &      & Zn &  4.53 & 0.06 & 0.27 & 4.54 & 0.13 & 1 & & & \\
   &      & $Z$& 0.0194&      &      & 0.0203 & & &   0.168 & & \\
\hline
\end{tabular}}
\medskip
Sources:
(1) Bensby et~al. (\cite{Ben05}),
(2) Bensby \& Feltzing (\cite{Ben06}),
(3) Lyubimkov et~al. (\cite{Lyu04}),
(4) Daflon \& Cunha (\cite{Daf04}),
(5) Rolleston et~al. (\cite{Rol00}),
(6) Cunha et~al. (\cite{Cun06}),
(7) Lyubimkov et~al. (\cite{Lyu05}), 
(8) Holmgren et~al. (\cite{Hol90}),
(9) Cunha \& Lambert (\cite{Cun94}).
\end{table}