H⁺ mole fraction profiles resulting from the fit of the measured absorption (large circles in Fig. 4) for HAT-P-32 b (H/He = 99/1, top left panel), WASP-69b (H/He = 98/2, top right panel), GJ 1214b (H/He = 98/2, bottom left panel), and WASP-76b (H/He = 98/2, bottom right panel). For comparison, also included are the results for H/He = 90/10 for all planets. The x-axis ranges are different. The solid thicker lines are the mean profiles.