Fig. 1
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Sky maps of the observed sightlines. Left: positions of the background sources observed here are projected against a map of EB–V from the work; of Schlegel et al. (1998). The sightlines lacking detected HCO+ absorption (largely due fo weak continuum) are indicated with smaller symbols. Right: same as left, but shown against a map of N(DNM) from Remy et al. (2017, 2018).
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