Reference Label	Details
note unc	The quoted uncertainty appeared to correspond to one std dev. and was multiplied by 2 to come closer to the desired 95% confidence limit
Wang 2014	L. Wang, C. Li, Z.-C. Yan, and G. W. F. Drake, Phys. Rev. Lett. 113, 263007/1-5 (2014) Fine Structure and Ionization Energy of the 1s2s2p 4P State of the Helium Negative Ion He-