Circles correspond to W_λ(5780)/E_(B−V) (top) and W_λ(5797)/ E_(B−V) (bottom). Background: IRAS 100 μm dust map. Targets are indicated by their target number as defined in Table 1. White circles represent σ-type sightlines and black circles ζ-type sightlines, except those labeled “i” which are of intermediate type. Targets labeled with “*” have relative errors on the ratio between 30 and 60%, while errors larger than 60% are omitted. The circle sizes for W(5797)/E_(B−V) are multiplied by a factor 2 with respect to those for W(5780)/E_(B−V).