Profiles of temperature and neutral densities (top), ion densities (middle), and the He(2³S) metastable state density (bottom) for the three warm exo-Neptunes. Solid, dotted, dashed, and dotted-dashed curves refer to calculations based on k_{R2, v = 0}, k_R2, LTE^the, k_R2, LTE^exp, min, and k_R2, LTE^exp, max, respectively. Gray boxes in the bottom panel show the range of opaque radii calculated here (Table 1).