Detection function map of the RV time series of TOI-4515. The gray part corresponds to the area in the period–minimum mass space, where additional signals could be detected if present in the data, while the black region corresponds to the area where the detection probability is negligible. The red dot represents TOI-4515 b, for reference. At around P = 7.5 d, there are some low-sensitivity spots even at large masses, which are caused by the 1/2 aliases of P_rot and P_orb.