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
Drake 1998	G. W. F. Drake and P. C. Martin, Can. J. Phys. 76, 679-698 (1998) Ionization Energies and Quantum Electrodynamic Effects in the Lower 1sns and 1snp Levels of Neutral Helium (4He I)