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Fig. 1.

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Different DTD functions assumed in this work: Matteucci & Recchi (2001, solid blue curve); Mannucci et al. (2006, dotted green curve); wide and close from Greggio (2005, dashed blue and solid green curves, respectively); Totani et al. (2008, solid red curve); Pritchet et al. (2008, dashed red curve); and Strolger et al. (2005, dotted red curve). The optimal combination of DTDs detailed in Sect. 5.2 is denoted by the dotted-dashed black line. All the distributions are normalized by their maximum.

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