Line list for minor acetylene isotopologs

By employing a robust {chi}^2^ fitting method, we simultaneously determined the temperature and column density, achieving a ^12^C/^13^C ratio of 18.73^+1.54^_-1.47_ for the blue clump and 15.07^+1.61^_-1.60_ for the red clump.

These results revealed significant discrepancies with the traditional rotational diagram method, which overestimated the ratios by 12.1% and 23.9%, respectively. Our {chi}^2^ approach also reduced uncertainties by up to 75%, providing more precise and reliable isotopic ratios. additionally, we extended the analysis to isotopologs not covered in hitran, calculating vibrational and rotational constants through quantum chemical calculations.