Envelope composition as a function of temperature for Z = 0.2, 0.4, and 0.7. M_P = 0.29 M_⊕ for all profiles (planetary mass when M_core (Z = 0.7) = M_crit (Z = 0.7)). Left column: non-restricted case. Right column: restricted case. In the non-restricted case water (solid lines) coexists in vapour phase (blue curve), solid phase (cyan curve), and even liquid phase (violet curve) in the case of Z = 0.7. Except H₂O in solid and liquid phase, the other 13 species shown here were considered in HI11. In the restricted case, water only exists in vapour phase.