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Fig. 21.
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Al II 1671 vs. Al III 1855 and Si II 1527 vs. Si IV 1394, compared at bright (upper profiles) and faint (lower profiles) state (IUE spectra). The black profiles are the Al II and Si II lines. The spectra were median-filtered to three points and normalized with the continuum level at −1800 km s−1.
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