Light curve of KMT-2021-BLG-0588. The bottom panel shows the whole view of the light curve, and the upper panels show the zoom-in view of the light curve, models, and residuals in the region around the strong peak. The dotted and solid curves drawn over the data points are the models of the close and wide solutions, respectively. The two insets in the bottom panel show the lens-system configurations of the close and wide models.