In the case of water, there is a phase coexistence line (called the liquid-gas coexistence curve) which ends in a critical point. And this line separates the gas phase from the liquid phase in the P-T phase diagram.
1. Do we observe such coexistence line below $T_c$ in the case of normal to superfluid transition below the critical point?
2. If yes, what are the phases that this line separates?