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Oscillator strengths of nine weak Fe I resonance lines (Multiplet 1, AA5 110-5255) determined from nearly simultaneous hook and photoelectric absorption measurements are presented. Comparison of these results with the commonly used oscillator strengths of Corliss and Tech supports the hypothesis of Bell and Upson that the data reflect an intensity-dependent error. The size of the intensity correction determined from our results is somewhat larger than that predicted by Bell and Upson.
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Huber et al. (1972) studied this question.
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