\begin{table}%t1
\caption {\label{table:casitrattati}Computed sets of evolutionary tracks and pulsation
  models. }        
%\centerline
 {                     
\begin{tabular}{l l l l}       
\hline\hline
Case & $Y$ & $Z$ & Mixture \\  
\hline  
I  ($std$)   & 0.26  & 0.005  & AGS05 \\ 
II ($Z_{\rm low}$)  & 0.26  & 0.0035 & AGS05 \\
III ($Z_{\rm high}$)  & 0.26  & 0.008  & AGS05 \\
IV ($Y_{\rm high}$)   & 0.28  & 0.005  & AGS05 \\
V ($Y_{\rm high}$, $Z_{\rm high}$)&0.28  & 0.008  & AGS05 \\
VI ($Z_{\rm high}$, GS98)&0.26& 0.008  &GS98 \\
VII  ($^{12}$C($\alpha$, $\gamma$)$^{16}$O)$_{\rm high}$   &0.26 &0.005&AGS05\\ 
VIII ($^{12}$C($\alpha$, $\gamma$)$^{16}$O)$_{\rm low}$  &0.26 &0.005&AGS05\\ 
IX ($^{14}$N($p$, $\gamma$)$^{15}$O)$_{\rm high}$  &0.26 &0.005&AGS05\\ 
X ($^{14}$N($p$, $\gamma$)$^{15}$O)$_{\rm low}$  &0.26 &0.005&AGS05\\ 
XI ($l_{\rm ov}=0.1 H_{\rm p}$) &0.26 &0.005&AGS05 \\ 
XII ($l_{\rm ov}=0.25 H_{\rm p}$) &0.28 &0.005&AGS05\\
XIII ($l_{\rm ov}=0.25 H_{\rm p}$) &0.26 &0.005&AGS05\\
\hline                                
\end{tabular}}
\smallskip
GS98~=~\citet{gre98}, AGS05~=~\citet{aspl05}.
\end{table}