Fig. 4.
Binary systems resolved using lucky spectroscopy with WHT/ISIS (published in Maíz Apellániz et al. 2018 and unpublished) and HST/STIS and unresolved systems using HST/STIS in the d − ΔB plane. The gray curves mark the tentative empirical boundaries between the regions in the plane accessible with different techniques: the left one is for HST/STIS and the right one for lucky spectroscopy with WHT/ISIS.
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