Cumulative percentage of mass loss as a function of Δt = t − T_age. Red, green, and blue lines refer to planetary masses of 1 × M_ul, , and , respectively. Stellar ages of 30, 50, and 80 Myr are shown in solid, dashed, and dotted lines, respectively. The shaded areas represent the threshold of mass loss: above this limit the planet cannot lose any further mass. Upper panel: TOI-942 b. Bottom panel: TOI-942 c.