Rosseland mean opacities κross as a functionof orbital distance in our disc model using α = 0.001 and uf = 1 m s−1 for all chemical compositions. We vary the chemical composition of the grains in the disc following the approach of Bitsch & Battistini (2020). Here, [Fe/H] implies only a change of the composition of the grains (Table 2), not a change of the dust-to-gas ratio. We note that in Bitsch & Battistini (2020), [Fe/H] = 0.4 implies a very low water fraction, while [Fe/H] = −0.4 provides a large water fraction.
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