Reference Label	Details
est unc	estimated uncertainty
Martin 1992b	M. Martin, J. Photochem. Photobiol. A 66, 263–289 (1992) C2 Spectroscopy and Kinetics
Douay 1988a	M. Douay, R. Nietmann and P. F. Bernath, J. Mol. Spectrosc. 131, 250-260 (1988) New Observations of the A 1Piu - X 1Sigmag+ Transition (Phillips System) of C2
Davis 1988	S. P. Davis, M. C. Abrams, Sandalphon, J. W. Brault, and M. L. P. Rao, J. Opt. Soc. Am. B 5, 1838-1847 (1988) Improved Molecular Parameters for the Ballik—Ramsay System of Diatomic Carbon (b 3Sigmag- - a 3Piu)
Davis 1988a	S. P. Davis, M. C. Abrams, J. G. Phillips and M. L. P. Rao, J. Opt. Soc. Am. B 5, 2280-2285 (1988) Infrared Bands of the C2 Phillips System
Tanabashi 2007	A. Tanabashi, T. Hirao, T. Amano, and P. F. Bernath, Astrophys. J. Suppl. Ser. 169, 472-484 (2007) The Swan System of C2: A Global Analysis of Fourier Transform Emission Spectra