Mass–detection limit curve (calculated according to the LPA method (Meunier et al. 2012) of the planetary system HD 20003 with its two confirmed planets (Udry et al. 2019). We approximate the planet detection probability for this star (p_S = 0.48) as the ratio between the area above its mass detection limit curve (white area) and the total area of the rectangle in the period-mass range of 2–100 days and 1–20 M_⊕.