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Fig. 7.
values as a function of the assumed isotopic ratio ξ for the Voigt profile fit of Mg II lines explicitly including all three isotopes in the model. 
(891 degrees of freedom) is reached for ξ = 0.24 (dotted orange line). The corresponding 1σ range goes from ξ = 0.01 to ξ = 0.63 (green dotted lines).
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