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Fig. 1

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Spectra obtained with the IRAM-30 m telescope. The velocity scale is given relative to the Local Standard of Rest (LSR). The spectra have been normalized by dividing the individual measurements by the source continuum intensities. The CCH  spectra have been offset for clarity. Except for G10.6, the two strongest CCH  hyperfine components at 87.317 and 87.329 GHz are shown. The emission line shifted by −31.6      km   s-1 from c-C3H2  is the HCS+J = 2–1  transition at 85.347 GHz. An inset showing the velocities of the absorption features is presented for G10.62.

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