Configuration of the OGLE-2017-BLG-0604 lens system. Upper right inset: close-up view of the planetary caustic and the source trajectory. Two lower left insets: configurations of the two degenerate solutions obtained from modeling with only the OGLE data, which do not cover the first part of the anomaly at HJD′ ~ 7869.6. These degenerate solutions cannot explain the first part of the anomaly, although they describe the second part of the anomaly as the presented solution almost equally well.