Mass–radius diagram for the secondary component of TIC 43152097 (red dot). SPOT isochrones (Somers et al. 2020) at 28 Myr (log(age) = 7.45) for a spot covering factor of 0%, 34%, and 68% are overlaid with different colors, as indicated in the legend. The hatched areas delimit, per each value of F_spot, an age uncertainty of Δlog(age) = 0.05. As a comparison, the value derived with JKTEBOP assuming a third light L₃ = 0 (R₂ = 0.915 R_⊙) is also shown by the white dot. A larger spot coverage is necessary to reproduce the observations in this case. The value of R₂ = 0.865 R_⊙, derived with JKTEBOP with the best-fit value of L₃ = −0.094, is also overlaid with a cyan dot.