Reference Label	Details
Huber 1979	K. P. Huber and G. Herzberg, "Molecular Spectra and Molecular Structure. IV. Constants of Diatomic Molecules", Van Nostrand Reinhold: New York 1979
est unc	estimated uncertainty
Liu 1971	B. Liu, Phys. Rev. Lett. 27, 1251-1253 (1971) Dissociation Energies of He2+ (X 2Sigmau+) and He2 (A 1Sigmau+)