Detectability map of GJ 3988 b using the TESS 2 min data corresponding to sectors 24, 25, 26, 50, 51, 52, and 53. We explored a total of 1350 different scenarios. Larger recovery rates are presented in yellow and green colours, while lower recovery rates are in blue and darker hues. In the parameters space explored, each combination of R_planet−P_planet yielded a recovery rate of nearly 100%, which allows us to confirm the non-transiting nature of this system robustly. The blue dot refers to the planet GJ 3988 b assuming its transiting nature.