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Fig. 1

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A) black line shows the PACS spectrum of Titan, expressed in line-to-continuum ratios. The coloured marks at the top show the selected lines and transitions for the analysis in Sect. 4. The dashed line indicates spectral regions affected by spectral leakage due to grating order overlap. B) best-fit synthetic spectra indicating the signatures attributable to CH4, CO, H2O, and HCN (Sect. 4). C)D) the [170–176] and [181–187] μm regions of the PACS spectrum displaying signatures of the isotopologues, along with the best-fit model with the detected isotopic variants.

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