\begin{table}%t3
\caption{Global parameters of  models differing by the way convection is treated:  the Canuto \& Mazitelli theory  and $\lambda = 1.$, and the classical mixing length theory with 
$\lambda = 1.9, 1.7$. (a)~MS~models $M_\star = 1.46~M_\odot$,
(b) PoMS~models $M_\star = 1.38~M_\odot$). }\label{tab:conv146+138}
%\centering
\small
\begin{tabular}{cccc}  
\hline
\hline
$\lambda$& 1.(CM)& 1.9 & 1.7 \\
\hline
(a)&&&\\
$t$(Myr)        & 1600   & 1690    & 1600   \\
$R_\star$/$R_\odot$ & 2.048  & 2.049   & 2.043  \\
  $\left(Z/X\right)_{\rm s} $  &  0.018 & 0.021   & 0.018  \\
 $\rm{ [Fe/H]_s}$ & --0.134 & --0.062  & --0.129 \\
$Y_{\rm s}$  & 0.183  & 0.209   & 0.185  \\
 $X$c       & 0.294  & 0.265   & 0.293   \\ 
$r_{\rm core}/R_\star$&  0.078 & 0.076   &  0.078  \\ 
$r_{\rm env}/R_\star$ & 0.919  & 0.888   & 0.918  \\
(b)&&&\\
$t$ (Myr)        & 2255   & 2290    & 2260    \\
$R_\star$/$R_\odot$ & 2.050  & 2.062   & 2.068  \\
  $\left(Z/X\right)_{\rm s} $  &  0.0215 & 0.023   & 0.021  \\
 $\rm{\left[Fe/ H\right]_s}$ & --0.057 & --0.026  & --0.068  \\
$Y_{\rm s}$  & 0.183  & 0.244   & 0.226   \\
$r_{\rm env}/R_\star$ & 0.904  & 0.880   & 0.905   \\
\hline
\end{tabular}
\end{table}