Fig. 7
Upper limits derived in this study. a) The envelope shape (upper limits) of all allowed shapes (dark gray lines). Also shown are the grid points as light gray bullets. b) The constraints compared to the the upper limits of MR07, Aharonian et al. (2006, 2007a), and Albert et al. (2008). c) Upper limits of this study together with three EBL models (Franceschini et al. 2008; Kneiske & Dole 2010; Domínguez et al. 2011). d) Upper limits requiring different minimum numbers of VHE spectra that exclude an EBL shape.
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