\begin{tabular}{lrrrrrr}
\toprule
 & Coef. & Std.Err. & t & P>|t| & [0.025 & 0.975] \\
\midrule
const & 17.880598 & 10.325727 & 1.731655 & 0.088744 & -2.796314 & 38.557509 \\
x1 & 0.387451 & 0.688193 & 0.562997 & 0.575645 & -0.990632 & 1.765533 \\
x2 & -0.494529 & 0.027036 & -18.291331 & 0.000000 & -0.548668 & -0.440390 \\
\bottomrule
\end{tabular}