SolEx: A model for mixed COHSCl-volatile solubilities and exsolved gas compositions in basalt

► User-friendly modelling of solubility and partitioning in the system C-O-H-S-Cl. ► Link SO2 and HCl volcanic emissions to dynamically important CO2 and H2O. ► Constrain volcano dynamics with S and Cl measurements from melt inclusions.