Fig. 5
Sstacked XMM-Newton RGS high-resolution spectrum produced by combining all Ark 564 RGS observations to date (in black). The final best fit (in red) consists of galactic absorption, broad and narrow Gaussian emission lines, three phases of photoionized warm-absorbers, all on a continuum modelled by spline interpolation. Lower panel: residuals (black) for this fit.
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