\begin{tabular}{*{2}{l}}
\hline
                  & M1   \tabularnewline
                   &Estimate \tabularnewline
                 &(S.E.) \tabularnewline
 \hline
 \hline
   (Intercept)     &-12.338 \tabularnewline
                 &(7.175)  \tabularnewline
   x1              &0.184 \tabularnewline
                 &(0.130)  \tabularnewline
   x2              &0.485*** \tabularnewline
                 &(0.089)  \tabularnewline
 \hline
 N                 &16       \tabularnewline
 RMSE             &4.989   \tabularnewline
 $R^2$             &0.736   \tabularnewline
 adj $R^2$         &0.695   \tabularnewline
 \hline
\hline
 
 \multicolumn{2}{c}{${*  p}\le 0.05$${*\!\!*  p}\le 0.01$${*\!\!*\!\!*  p}\le 0.001$}\tabularnewline
 \end{tabular}