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Fig. 1

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Millimeter lines attributed to the l-C3H+ cation in the PDR (lower panels) and the dense core (upper panels) positions. The numbers above each panel are the line rest frequencies in MHz. The spectra and the Gaussian fits are shown as black histograms and green curves, respectively. The inferred rest frequencies are displayed as vertical dotted black lines for vlsr = 10.7   km   s-1 and  ± 3σ noise levels as horizontal dotted red lines.

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