Diagram of the LavAtmos 2.0 equilibrium code: the given input (top of the diagram) includes the melt composition, temperature and pressure at the surface of the melt, and the elemental abundances of the volatile elements in the atmosphere. The output consists of partial pressures of all of the species in the atmosphere. The vaporisation reactions are calculated in the same way as in van Buchem et al. (2023). See Section 2 for a more detailed explanation of how the code works.