Fig. 4
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Mixing ratio of SO2 in VULCAN models with various photodissociation reactions switched off to isolate their contribution. If H2O photodissociation is turned off, SO2 is less abundant at 10−6 bar. If both S2 and SH photodissociation are turned off, SO2 is less abundant at 10−4 bar. If only S2 or SH photodissociation is turned off, the SO2 abundance is not affected significantly.
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