Fig. 5.
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Redshift evolution of the total C mass density, ΩC (top panel), and the C+ mass density, ΩC+ (bottom panel). The lines refer to results from CDM Ref (light blue), CDM HR (purple), and CDM LB (green), while symbols refer to observations of C IV (diamonds; D’Odorico et al. 2022), C II + C IV (stars; Davies et al. 2023), and C II (triangles; Davies et al. 2023).
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