Comparison between astronomical spectra integrated-intensity ratios of aromatic C=C band at 1600 cm−1 to aliphatic CHx band at 1460cm−1 according to the aliphatic CHx 1375 cm−1/1460 cm−1 ratio. The green diamonds correspond to the diffuse interstellar medium a-C:H absorptions. The red squares correspond to the class and sources in this study. The blue dots are the same ratios measured on the infrared spectra of the produced analogues.
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