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Fig. 1

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Calculated optical depth for all five sources in wavelength range of interest. Gray shaded area shows the optical-depth 3σ uncertainty level. Although the spectra are extracted off-source (see Table A.1), some CO emission lines are still seen in the spectra. The CN stretching mode vibration band is shaded in light blue. The emission line between the 13CO2 ice feature and the CN stretching band is the H2 0 – 0 S(10) line (marked with the dashed magenta line).

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