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The Fe I spectrum has been investigated in the region 1-4 μm with one of the Fourier Transform Spectrometers at Laboratoire Aimé Cotton, Orsay. The line list contains 374 lines, most of them measured with an accuracy better than 5 × 10 -3 cm -1 . A comparison with the solar spectrum confirms many previous identifications and gives about 100 new identifications of solar lines as due to Fe I.
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Litzén et al. (1976) studied this question.