Fig. 1
Absorption spectra observed toward J1717-3342 (left) and J1744-3116 (right). The spectra were normalized by the continuum flux density. The CO+ spectra were shifted vertically and multiplied by 10. HCO+ is shown in black, CO+ in red, and 13CO(2–1) in blue for comparison. The HCO+ data are taken from Liszt & Gerin (2018) and Gerin & Liszt (2017).
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