\begin{tabular}{*{2}{l}}
\hline
                  & M1   \tabularnewline
                   &Estimate \tabularnewline
                 &(S.E.) \tabularnewline
 \hline
 \hline
   (Intercept)     &-22.643 \tabularnewline
                 &(10.837)  \tabularnewline
   x1              &0.130 \tabularnewline
                 &( 0.196)  \tabularnewline
   x2              &0.757*** \tabularnewline
                 &( 0.134)  \tabularnewline
 \hline
 N                 &16       \tabularnewline
 RMSE             &7.535   \tabularnewline
 $R^2$             &0.730   \tabularnewline
 adj $R^2$         &0.688   \tabularnewline
 \hline
\hline
 
 \multicolumn{2}{c}{${*  p}\le 0.05$${*\!\!*  p}\le 0.01$${*\!\!*\!\!*  p}\le 0.001$}\tabularnewline
 \end{tabular}