\begin{table}%t9
%\centering
\par
\caption{\label{metcomp} Compilation   of  high-resolution  studies  on  open
clusters.    The first  panel  shows  the   results of  the  abundance
analyses,  while  the  second  one  summarises  dataset  and clusters'
properties, showing, in the given order, the number of stars used, the
reference (i.e. number  in the bibliography  and ``PPF'' for the present
study;   some of  the cited      references for  the abundances    are
compilations of the results obtained  by the same group), the spectral
resolution  power,  the instrument  and/or   the telescope   employed,
clusters' Galactocentric distances and  ages.   The two latter  values
are flagged  with a letter  according  to the   reference used: 
F  for
\cite{fj93}, B for \cite{BOCCE}, C for \cite{cc94} and W for the WEBDA
database.}
%\centerline
 {\begin{tabular}{l c c c c c c c c}  
\hline 
\hline
Cluster        &[Fe/H]        &[O/Fe]        &[Al/Fe]       &[Ni/Fe]       &[Na/Fe]       &[Si/Fe]       &[Ca/Fe]       &[Ti/Fe]       \\
\hline						$\alpha$  Per  &--0.06~$\pm$~0.05&     --       &     --       &     --       &     --       &     --       &     --       &     --       \\
Be 17          &--0.10~$\pm$~0.09& 0.00~$\pm$~0.05& 0.25~$\pm$~0.09& 0.02~$\pm$~0.09& 0.37~$\pm$~0.08& 0.30~$\pm$~0.05&--0.04~$\pm$~0.03&--0.1~$\pm$~0.08\\
Be 20          &--0.45~$\pm$~0.05& 0.18~$\pm$~0.05& 0.18~$\pm$~0.01&--0.02~$\pm$~0.02& 0.2~$\pm$~0.1 & 0.05~$\pm$~0.03& 0.08~$\pm$~0.01& 0.38~$\pm$~0.06\\
Be 22          &--0.32~$\pm$~0.19&     --       & 0.28~$\pm$~0.05& 0.04~$\pm$~0.01& 0.04~$\pm$~0.05&--0.04~$\pm$~0.1 &--0.08~$\pm$~0.02& 0.11~$\pm$~0.1 \\
Be 29          &--0.49~$\pm$~0.05& 0.21~$\pm$~0.02& 0.23~$\pm$~0.03& 0.05~$\pm$~0.06& 0.38~$\pm$~0.01& 0.20~$\pm$~0.02& 0.06~$\pm$~0.04& 0.18~$\pm$~0.16\\
Be 31          &--0.57~$\pm$~0.23& 0.24~$\pm$~0.08& 0.22~$\pm$~0.13& 0.11~$\pm$~0.12& 0.27~$\pm$~0.10& 0.20~$\pm$~0.14& 0.13~$\pm$~0.05& 0.08~$\pm$~0.09\\
Be 32          &--0.29~$\pm$~0.04&     --       & 0.11~$\pm$~0.10& 0.00~$\pm$~0.04& 0.12~$\pm$~0.07& 0.12~$\pm$~0.04& 0.07~$\pm$~0.04& 0.02~$\pm$~0.06\\
Be 66          &--0.48~$\pm$~0.24&     --       & 0.00~$\pm$~0.2 & 0.24~$\pm$~0.25& 0.15~$\pm$~0.2 &     --       &--0.05~$\pm$~0.2 & 0.43~$\pm$~0.2 \\
Blanco 1       & 0.04~$\pm$~0.02& 0.02~$\pm$~0.11&     --       &--0.18~$\pm$~0.01&     --       &--0.09~$\pm$~0.02&--0.09~$\pm$~0.02&--0.10~$\pm$~0.03\\
Collinder 261  &--0.12~$\pm$~0.09&--0.15~$\pm$~0.05& 0.25~$\pm$~0.13& 0.04~$\pm$~0.02& 0.41~$\pm$~0.07& 0.23~$\pm$~0.01&--0.01~$\pm$~0.02&--0.09~$\pm$~0.02\\
Coma  Ber      &--0.05~$\pm$~0.03&     --       &     --       &     --       &     --       &     --       &     --       &     --       \\
Hyades         & 0.13~$\pm$~0.05&     --       &     --       &     --       & 0.01~$\pm$~0.09& 0.05~$\pm$~0.05& 0.07~$\pm$~0.07& 0.03~$\pm$~0.05\\ 
IC 2391        & 0.06~$\pm$~0.06&     --       &     --       &     --       &     --       &     --       &     --       &     --       \\
IC 4651        & 0.12~$\pm$~0.05&     --       &--0.10~$\pm$~0.06&--0.02~$\pm$~0.08&--0.03~$\pm$~0.07&--0.02~$\pm$~0.05& 0.04~$\pm$~0.06&--0.02~$\pm$~0.07\\
IC 4665        &--0.03~$\pm$~0.04&     --       &     --       & 0.05~$\pm$~0.13&     --       & 0.09~$\pm$~0.19& 0.03~$\pm$~0.14& 0.21~$\pm$~0.17\\
M 35           &--0.21~$\pm$~0.10&     --       &     --       &     --       &     --       &     --       &     --       &     --       \\
M 67           & 0.03~$\pm$~0.04&--0.07~$\pm$~0.08&--0.03~$\pm$~0.11&--0.02~$\pm$~0.07&--0.02~$\pm$~0.07&--0.03~$\pm$~0.06& 0.03~$\pm$~0.07&--0.02~$\pm$~0.11\\
NGC 188        &--0.12~$\pm$~0.16&     --       &     --       &     --       &     --       &     --       &     --       &     --       \\
NGC 2141       &--0.18~$\pm$~0.15& 0.00~$\pm$~0.06& 0.18~$\pm$~0.07& 0.04~$\pm$~0.11& 0.41~$\pm$~0.04& 0.05~$\pm$~0.19& 0.10~$\pm$~0.04& 0.24~$\pm$~0.11\\
NGC 2324       &--0.17~$\pm$~0.05&     --       & 0.00~$\pm$~0.08&--0.09~$\pm$~0.02& 0.31~$\pm$~0.10& 0.06~$\pm$~0.11& 0.15~$\pm$~0.05&--0.08~$\pm$~0.03\\
NGC 2477       & 0.07~$\pm$~0.03&     --       &--0.01$\pm$0.04& 0.00~$\pm$~0.04& 0.12~$\pm$~0.03& 0.05~$\pm$~0.03&--0.01~$\pm$~0.01& 0.01~$\pm$~0.06\\
NGC 2506       &--0.20~$\pm$~0.01&     --       &     --       &     --       &     --       &     --       &     --       &     --       \\
NGC 2660       & 0.04~$\pm$~0.04&     --       &--0.08~$\pm$~0.10&--0.03~$\pm$~0.02& 0.12~$\pm$~0.04& 0.00~$\pm$~0.03& 0.04~$\pm$~0.05& 0.00~$\pm$~0.03\\
NGC 3680       &--0.04~$\pm$~0.03& 0.2 ~$\pm$~0.05&--0.08~$\pm$~0.04&--0.05~$\pm$~0.03& 0.01~$\pm$~0.08&--0.01~$\pm$~0.04& 0.04~$\pm$~0.06& 0.04~$\pm$~0.07\\
NGC 3960       & 0.02~$\pm$~0.04&     --       &--0.06~$\pm$~0.06&--0.01~$\pm$~0.03& 0.09~$\pm$~0.03& 0.04~$\pm$~0.05& 0.02~$\pm$~0.03&--0.04~$\pm$~0.02\\
NGC 6134       & 0.15~$\pm$~0.03&     --       &     --       &     --       &     --       &     --       &     --       &     --       \\
NGC 6253       & 0.41~$\pm$~0.05&--0.18~$\pm$~0.06&--0.08~$\pm$~0.12&--0.01~$\pm$~0.06& 0.21~$\pm$~0.02& 0.05~$\pm$~0.03&--0.03~$\pm$~0.01&--0.1 ~$\pm$~0.1 \\
NGC 6791       & 0.47~$\pm$~0.07&--0.31~$\pm$~0.08&--0.21~$\pm$~0.09&--0.07~$\pm$~0.07& 0.13~$\pm$~0.21&--0.01~$\pm$~0.10&--0.15~$\pm$~0.08& 0.03~$\pm$~0.09\\
NGC 6819       & 0.09~$\pm$~0.03&     --       &--0.07~$\pm$~0.07& 0.01~$\pm$~0.02& 0.47~$\pm$~0.07& 0.18~$\pm$~0.04&--0.04~$\pm$~0.06&--0.01~$\pm$~0.04\\
NGC 7789       &--0.04~$\pm$~0.05&--0.07~$\pm$~0.09& 0.18~$\pm$~0.08&--0.02~$\pm$~0.05& 0.28~$\pm$~0.07& 0.14~$\pm$~0.05&     --       &--0.03~$\pm$~0.07\\
Pleiades       &--0.03~$\pm$~0.02&     --       &     --       &     --       &     --       &     --       &     --       &     --       \\
Praesepe       & 0.27~$\pm$~0.10&--0.4~$\pm$~0.2 &--0.05~$\pm$~0.12&--0.02~$\pm$~0.1 &--0.04~$\pm$~0.12&--0.01~$\pm$~0.12& 0.00~$\pm$~0.11&--0.04~$\pm$~0.12\\
Saurer 1       &--0.38~$\pm$~0.14& 0.47~$\pm$~0.13& 0.33~$\pm$~0.02& 0.20~$\pm$~0.05& 0.44~$\pm$~0.05& 0.38~$\pm$~0.1 & 0.20~$\pm$~0.04& 0.12~$\pm$~0.12\\
\hline
\end{tabular}}
\par
 {\begin{tabular}{l c c c c c c c}  
\hline 
\hline 
Cluster        &$N$&Ref.           &$R$ &\multicolumn{2}{c}{Instr/OBS}      & $R_{\rm GC}$ [kpc]&Age [Gyr]   \\
\hline								   
$\alpha$  Per  &6&  9            &60 \& 30~K &\multicolumn{2}{c}{CFHT \& Hale            }&  8.2  W& 0.07~W   \\
Be 17          &3& 10                 &25~K &\multicolumn{2}{c}{KPNO                   }& 10.7  W&12   W   \\
Be 20          &2& 18                 &28~K &\multicolumn{2}{c}{KPNO \& CTIO           }& 15.9  W& 6.0 W   \\
Be 22          &2& 17                 &34~K &\multicolumn{2}{c}{HIRES/KECK             }& 14.02 B& 2.40~B   \\
Be 29          &\multicolumn{5}{c}{See Table \ref{comptab}}                            & 20.81 B& 3.70~B   \\
Be 31          &1& 18                 &28~K &\multicolumn{2}{c}{KPNO \& CTIO           }& 15.8  W& 2.0 W   \\
Be 32          &9& 4, 13               &47~K &\multicolumn{2}{c}{UVES/VLT               }& 11.30 B& 6.5 B   \\
Be 66          &1& 17                 &34~K &\multicolumn{2}{c}{HIRES/KECK             }& 12.4  W& 5.0 W   \\
Blanco 1       &8&  8                 &50~K &\multicolumn{2}{c}{Anglo/Aus              }&  8.0  W& 0.62~W   \\
Collinder 261  &\multicolumn{5}{c}{See Table \ref{comptab}}                            &  6.96 B& 6   B   \\
Coma  Ber      &14& 9                 &60~K &\multicolumn{2}{c}{CFHT                   }&  8.0  W& 0.4 W   \\
Hyades         &98&12                 &60~K &\multicolumn{2}{c}{HIRES/KECK             }&  8.0  W& 0.8 W   \\
IC 2391        &66&14                 &50~K &\multicolumn{2}{c}{FEROS/2.2m MPG--ESO    }&  8.0  W& 0.05 W  \\
IC 4651        &4& 1                  &100~K&\multicolumn{2}{c}{UVES/VLT               }&  7.8  L& 1.6 C   \\
IC 4665        &18& 15                &60~K &\multicolumn{2}{c}{HIRES/KECK             }&  7.7  W& 0.43~W   \\
M 35           &9& 2                  &20~K &\multicolumn{2}{c}{WIYN/HYDRA             }&  8.91 B& 0.18~B   \\
M 67           &6& 1                  &100~K&\multicolumn{2}{c}{UVES/VLT               }&  9.1  F& 4.8 C   \\
NGC 188        &7& 11                 &34~K &\multicolumn{2}{c}{KPNO                   }&  9.2  W& 4.3 W   \\
NGC 2141       &1& 18                 &28~K &\multicolumn{2}{c}{KPNO \& CTIO           }& 12.6  F& 4   F   \\
NGC 2324       &7& 4                  &47~K &\multicolumn{2}{c}{UVES/VLT               }& 11.4  W& 0.4 W   \\
NGC 2477       &6& 4                  &47~K &\multicolumn{2}{c}{UVES/VLT               }&  8.4  W& 0.7 W   \\
NGC 2506       &2& 6                  &48~K &\multicolumn{2}{c}{FEROS/1.5m             }& 10.38 B& 1.70~B   \\
NGC 2660       &5& 4, 13               &47~K &\multicolumn{2}{c}{UVES/VLT               }&  8.69 B& 0.95~B   \\
NGC 3680       &2& 1                  &100~K&\multicolumn{2}{c}{UVES/VLT               }&  8.3  F& 1.8 C   \\
NGC 3960       &6& 4, 13               &47~K &\multicolumn{2}{c}{UVES/VLT               }&  7.80 B& 1.2 B   \\
NGC 6134       &6& 6              &48~K \& 43~K&\multicolumn{2}{c}{FEROS/1.5~m \& UVES/VLT }&  7.2  W& 0.93~W   \\
NGC 6253       &\multicolumn{5}{c}{See Table \ref{comptab}}                            &  6.6  B& 3   B   \\  
NGC 6791       &5& 7                  &43~K &\multicolumn{2}{c}{UVES/VLT               }&  8.4  F& 4.4 W   \\
NGC 6819       &3& 3                  &40~K &\multicolumn{2}{c}{SARG/TNG               }&  7.71 B& 2   B   \\
NGC 7789       &9& 16                 &30~K &\multicolumn{2}{c}{SOFI/NOT               }&  9.4  F& 2   F   \\
Pleiades       &13& 9             &60 \& 30~K &\multicolumn{2}{c}{CFHT \& Hale           }&  8.1  W& 0.1 W   \\
Praesepe       &7&  1                 &100~K&\multicolumn{2}{c}{UVES/VLT               }&  8.1  W& 0.7 W   \\
Saurer 1       &2& 5                  &34~K &\multicolumn{2}{c}{HIRES/KECK             }&  9.7  W& 7.1 W   \\
\hline
\end{tabular}}
\par
\smallskip
\par
References:
(1) Present study;
(2) \cite{BYN};         
(3) \cite{Bragaglia01}; 
(4) \cite{BOCCE4};      
(5) \cite{Giovanni04};  
(6) \cite{cbgt04};      
(7) \cite{BOCCE3};      
(8) \cite{Ford05};      
(9) \cite{fb92};        
(10) \cite{frieletal05}; 
(11) \cite{ht90};        
(12) \cite{paulson03};   
(13) \cite{Paola06};     
(14) \cite{ppm};
(15) \cite{Shen05};      
(16) \cite{teti05};      
(17) \cite{Sandro05};    
(18) \cite{Yong05}.
\end{table}