Same as in Fig A.1, but for the synoptic map on December 31, 2023. Note that December 7’s ARs 13513 and 13514 at 137-degree longitude in Fig. A.2 rotate to the back side and reappear to the front as AR 13537 and 13536 respectively at the same longitude on December 31. Here, ARs resulting in X-class flares are highlighted in red, while active regions resulting in M-class flares are highlighted in orange.