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Fig. B.1.

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Representation of the idealized molecular mass distribution inside a multi-phase gas particle. The destruction of H2 is carried out following this schematic. The basic idea is that the H2 mass (+helium) is organized into Giant Molecular Clouds (GMC), represented by the smaller spheres, with mass MMC and radius RMC. These GMC are considered randomly distributed inside the gas particle, the volume of which is estimated as the ratio between the particle mass and the SPH density, with a corresponding size Rp. Stars younger than a given tesc are considered to be still within the GMC, while older stars are considered to be outside.

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