In the Ge–P system, a compound GeP exists. At 725°C, Ge, GeP and liquid of 62 at.% P are in three-phase equilibrium. At 577°C, GeP, P and liquid of 94.5 at.% P are in equilibrium. The melting points of Ge and P are 937 and 593°C respectively. Draw an approximate phase diagram of this system. Write down the invariant reactions, giving their names.

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