Equivalent width versus E_(B−V) for the 5780 (top) and 5797 Å (bottom) DIBs. The average Galactic relationships (dashed: Cox et al. 2005; and dotted: Friedman et al. 2011) and the linear least-squares fit for Upp Sco (solid; Sect. 5) are shown. Reduced chi-squared values () for the latter are indicated in the respective panels. Intercepts and slopes for the linear least-squares fits are given in Table 4. To avoid biases, the regressions were not forced to go through the origin, and upper limits for the Upp Sco data were not taken into account.