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Fig. 3


HCO+ and H13CO+ absorption profiles for three of the sources observed here. The H13CO+ are scaled upward as indicated and shown in blue over those of HCO+. Absorption toward J1744 is shown in two parts in the upper panels, with different scaling. Regions over which the profileswere integrated are shown outlined, at the mean level within each region: see Table 2 for results.

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