Supplementary analysis analogous to Figs. 1 and 2 but for the exoplanets K2-18 b (upper panels) and WASP-69 b (lower panels). The panels systematically explore the effect of varying the temperature contrast (left panels) and the filling factor (right panels). These supplementary figures confirm trends identified for LHS 1140 b while also highlighting the distinct stellar host type dependence (M-dwarf vs. K-type stars) of systematic biases between ECLIPSE-Xλ and TLSE. The dashed lines serve as reference markers, providing a visual support for interpreting variations in the data.