Generalized Lomb–Scargle periodogram of the archival HARPS RVs of GJ 1252. Each panel shows a different step of the one-planet model: the raw RVs (top); the RVs with the maximum a-posteriori (MAP) GJ 1252 b Keplerian model subtracted out (second); the RVs with the MAP stellar activity model subtracted out (third), and the RVs with both the MAP stellar activity model and GJ 1252 b Keplerian model subtracted out (bottom). Red lines corresponding to false alarm probabilities (FAPs) of 1% and 0.1% are overplotted, as are gray lines corresponding to 0.52 d (GJ 1252b period), 17.5d (GJ 1252 (c) period reported in Luque & Pallé 2022), and 64 d (the stellar rotation period reported in Shporer et al. 2020).