Spectral-line stacking can recover aggregate 13C-isotopologue emission without false positives, and existing TMC-1 observations could distinguish a local from an enriched carbon-isotope ratio in PAHs if the needed lab spectra existed.
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Exploring the Limits of Spectral Line Stacking in Spectral Line Data and Application Toward the Detection of Bulk $^{13}$C Enrichment of Aromatics in TMC-1
Spectral-line stacking can recover aggregate 13C-isotopologue emission without false positives, and existing TMC-1 observations could distinguish a local from an enriched carbon-isotope ratio in PAHs if the needed lab spectra existed.