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Fig. C.2.
Same as in Fig. 2 but with the colour code indicating differences in B/T from SDSS r-band photometry (Méndez-Abreu et al. 2017). The best twin of each AGN is indicated with a red circle. NGC 2540 does not have B/T value reported in Méndez-Abreu et al. (2017) and thus its corresponding ΔλR appears as a black square.
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