\begin{table}%t2
\caption{Global parameters of models differing by the way diffusion is treated varying the additional mixing parameter: (a)~MS~model of mass $M$~= 1.46~$M_\odot$,
(b)~PoMS~model of mass $M$~= 1.38~$M_\odot$.}\label{tab:dif146+138}
%\centering
\small
\begin{tabular}{cccc}  
\hline
\hline
Re$_\nu$ & 0.5& 1 & 1.5 \\ 
\hline
(a)&&&\\
$t$ (Myr) & 1600& 1600& 1600\\
$R_\star$/$R_\odot$ & 2.051 & 2.048 & 2.036 \\
 $\left(Z/X\right)_{\rm s}$ &  0.0134&  0.0180&  0.0206\\
$\rm{ [Fe/H]_s}$ & --0.263 & --0.134  & --0.075\\
$Y_{\rm s}$ & 0.144 & 0.183 & 0.205\\
 $X$c & 0.293  & 0.294 & 0.294 \\ 
 $r_{\rm core}/R_\star$&  0.078 &  0.078 &  0.078\\
 $r_{\rm env}/R_\star$ & 0.920 & 0.920 & 0.920\\
(b)&&&\\
$t$  (Myr)                    & 2400  & 2400  & 2400  \\
$R_\star$/$R_\odot$           & 2.05 & 2.066 & 2.05 \\
 $\left(Z/X\right)_{\rm s}$ & 0.0229& 0.0228& 0.0234\\
$\rm{ [Fe/H]_s}$   & --0.029 & --0.032  & --0.020 \\
$Y_{\rm s}$          & 0.240 & 0.239 & 0.245 \\
 $r_{\rm env}/R_\star   $ & 0.870 & 0.870 & 0.871\\
\hline
\end{tabular}
\end{table}