Temperature at the boundaries of the stable layer as a function of envelope basal pressure, using water. The blue and red curves correspond to the top and bottom of the stable layer respectively. As in Fig. 2, we use solid curves where we have data and dashed curves for the ideal gas approximation. We further use a dotted curve for the interpolated critical curve and for a notional (non-quantitative) altered inhibition curve that accounts for the non-ideal coexistence behavior of the water–hydrogen system. The intersection marker symbols from Fig. 2 (the blue, magenta, and red filed and open circles and the red star) are shown here for context.