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Fig. 4
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Extracted STIS spectra for a1, a2, a3, and c (from top to bottom), focusing on the diagnostic lines N IV λ4058, N V λλ4604,4620, He II λ4686, and N V λ4945 (from left to right). Epochs are listed in the legends. The spectra of a3 and c are binned at ∆λ = 0.5 Å for clarity.
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