Fig. 3
EUV spectra of highly charged Fe ions recorded with a flat-field grazing incidence spectrometer. The upper three plots are observed at electron beam energy of 340 eV, while the lower three plots are obtained at 400 eV. The electron beam current is written on each plot. Each spectrum was recorded for an exposure time of 30 min. In the top panel lines from different charge states of present interest are labelled as discussed in the text.
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