UV-continuum slope β vs. AV for all models at z ~ 4. Each cross shows the median value properties for each galaxy: blue for “strong” nebular emitters and red for “weak” nebular emitters. Black squares are median values by bins of 0.1 AV mag. The dashed red line is the relation between extinction (Calzetti et al. 2000) and a given β if the base spectrum is a young star-forming galaxy of constant star formation (Bouwens et al. 2009). The red line is a linear fit among the whole composite probability distribution function.
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