XMM-Newton/RGS spectra obtained from high (dashed line) and low (solid) flux good time intervals in the 15–17 Å (Fig. 6) region in which several density-sensitive Fe XVII lines are present for OBS2 and OBS3. The generally greater strengths of these lines and the 16.8 Å/17.0 Å ratio are discussed in the text. These spectra are smoothed over two 2 mÅ bins.
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