OCS/SO2 (upper panel), H2S/SO2 (middle panel) and SO/SO2 (lower panel) abundance ratios as a function of time at radius where the temperature is 100 K in the four studied sources. Initial composition of Model 2 is used. For each source, the observed abundance ratio is reported on the curves as horizontal thick line. Two values are drawn for IRAS 18162 as two SO2 abundances have been determined using two different lines (see Herpin et al. 2009). No observed value SO/SO2 is reported for IRAS 05358.
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