\begin{tabular}{lrrrrrrrr}
\toprule
 & \multicolumn{4}{c}{Random 5-fold CV} & \multicolumn{4}{c}{Spatially blocked 5-fold CV} \\
\cmidrule(lr){2-5}\cmidrule(lr){6-9}
Model & $R^2$ & RMSE & MAE & MdAPE (\%) & $R^2$ & RMSE & MAE & MdAPE (\%) \\
\midrule
OLS (M5) & 0.473 & 0.493 & 0.374 & 28.5 & 0.407 & 0.522 & 0.401 & 30.5 \\
Elastic net & 0.476 & 0.491 & 0.373 & 28.7 & 0.426 & 0.514 & 0.393 & 29.6 \\
Random forest & 0.543 & 0.459 & 0.346 & 26.7 & 0.483 & 0.488 & 0.372 & 28.5 \\
Gradient boosting & 0.557 & 0.452 & 0.342 & 26.7 & 0.480 & 0.489 & 0.376 & 29.5 \\
XGBoost & 0.559 & 0.450 & 0.339 & 26.4 & 0.483 & 0.488 & 0.375 & 28.8 \\
LightGBM & 0.552 & 0.454 & 0.341 & 26.1 & 0.482 & 0.488 & 0.372 & 28.5 \\
\bottomrule
\end{tabular}