A schematic view of the elemental abundance (re-)distribution for the THEMIS modelling approach to dust evolution in the transitions between dense clouds and the diffuse ISM. Ice mantles, which require ≃ 160 ppm of oxygen (e.g., Whittet 2010), are not illustrated for clarity. The repartition of all the major dust-forming elements (O, C, Si, Mg, Fe and S) are indicated in ppm.
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