HD 93963 A b & c (filled triangles) as a function of planetary radius and insolation, compared with the population of exoplanets. Colours represent a kernel density estimation (KDE) applied to small (R_p < 4 R_⊕), transiting planets retrieved from the NASA Exoplanet Archive (Akeson et al. 2013). The dashed and dotted lines (with associated 1 σ white error bands) show estimates for the position of the evaporation valley from Martinez et al. (2019) and Van Eylen et al. (2018) respectively.