Notes. Results of the fits to the broadband SEDs where photometry (phot) and X-Shooter spectrum (spec) is used to build the NIR-to-UV part. Here we focus on the extinction curve component of the models. For each model we report the χ²/d.o.f.; here we only consider models where Δβ and N_HI are left as free parameters (see Table A.1 for details and other models). The last two columns show whether a certain extinction curve is found to be preferential over the other two. In the X-Shooter case, the better coverage of the blue part of the optical SED sometimes allows us to distinguish between models even if their fits are of a similar quality according to the χ² (see Sect. 4.1): these models are marked with †.