Color maps showing ﹩{\gamma }_{+}﹩ (top panel) and ﹩{\gamma }_{-}﹩ (bottom panel) in the H₂O phase diagram. The phase diagram of water is identical to the one shown in Figure 1. Ma19+, Ma19-, and WP02- are the (P,T) profiles defined in the case of a 1 ﹩{M}_{\oplus }﹩ planet fully made of H₂O, with the atmospheric part shown with short dashes. Ma19- and WP02- interiors are almost indistinguishable, hence are represented by the same color, and all atmospheric profiles are identical, although the gravity at the boundary is different for each case.