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The high-resolution X-ray spectra taken during a large solar flare on 1979 June 10 are presented. Many lines of highly ionized iron are resolved and identified for the first time in solar spectra. Lines with a wide range of excitation temperatures have similar time development during the flare's rapid rise phase. The density sensitive line ratios in Fe XXI and Fe XXII are discussed.
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McKenzie et al. (1980) studied this question.
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