| Reference Label | Details |
|---|---|
| Moore 1970 | C. E. Moore, "Ionization Potentials and Ionization Limits Derived from Analyses of Optical Spectra", NSRDS-NBS 34, National Bureau of Standards: Washington, DC 1970 |
| est unc | estimated uncertainty |
| Bowen 1955 | I. S. Bowen, Astrophys. J. 121, 306-311 (1955) Wave Lengths of Forbidden Nebular Lines |
| Bowen 1960 | I. S. Bowen, Astrophys. J. 132, 1-17 (1960) Wave Lengths of Forbidden Nebular Lines. II |