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Fig. 12

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Comparison between selected observed line fluxes and the standard model with two zones (inside 4 AU a gas-to-dust mass ratio of 0.01 and outside 1.0). HCO+ fluxes are from the model with a 1000 times lower metallicity. Observed fluxes are denoted by filled circles with 3σ error bars and model fluxes by diamonds.

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