Binned Kepler photometry (blue dots) of the KOI population which both exists above the period–radius valley and below the H₂ atmospheric evaporation limit shown in Figure 4. Overlaid is a clear H₂ atmosphere (μ = 2 g mol^–1) refraction model (solid red line). Despite these exoplanets being the only ones in the APRV population capable of holding H/He atmospheres, any possible refraction effects are severely dampened when compared to the simulated effect for an optically thin H/He atmosphere.