Reference Label	Details
est unc	estimated uncertainty
Yamaguchi 1993	Y. Yamaguchi, G. Vacek, and H. F. Schaefer III, Theor. Chim. Acta 86, 97 (1993) Low-Lying Triplet Electronic States of Acetylene: cis 3B2 and 3A2, trans 3Bu and 3Au