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Over 4000 wave lengths are listed between 1900 and 9000 Å for Fe i, Fe ii, Ne i and Ne ii lines measured in a hollow cathode discharge tube with iron electrodes and a neon gas filling. Photoe-electric traces between 2400 and 5700 Å on a semiquantitative intensity scale are also included. For Fe i, energy values for 124 even and 240 odd levels have been computed. These have been used to calculate Ritz standards for most of the Fe i lines.
H. M. Crosswhite (Wed,) studied this question.