Reference Label	Details
est unc	estimated uncertainty
Huang 2012	D.-H. Huang, X.-H. Cheng, W.-Y. Lu, M.-J. Wan, and F.-H. Wang, Yuanzi Yu Fenzi Wuli Xuebao 29, 577-582 (2012) Potential Energy Function and Spectrum Data for X 1Sigma+, A 1Sigma+ and a 3Sigma+ States of HeH+ Molecule