Reference Label	Details
Sansonetti 2005	J. E. Sansonetti and W. C. Martin, J. Phys. Chem. Ref. Data 34, 1559-2259 (2005) Handbook of Basic Atomic Spectroscopic Data Web: http://physics.nist.gov/PhysRefData/Handbook/
Moore 1975	C. E. Moore, "Selected Tables of Atomic Spectra. A. Atomic Energy Levels - 2nd Ed. B. Multiplet Tables N I, N II, N III", NSRDS-NBS 3, Sect. 5, National Bureau of Standards: Washington, DC 1975