Fig. 3
Normalized spectral regions of all our sources at the central position at 64–68, 148–157, and 169–182 μm. Objects are shown in the evolutionary sequence, with the most evolved ones on top. Lines of CO are shown in red, H2O in blue, OH in light blue, CH in orange, and NH3 and C3 in green. Spectra are shifted vertically to improve the clarity of the figure.
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