Spectra (upper panels) and residuals in units of data/model ratio (lower panels) when the baseline model is applied to the spectra of the observations discussed in this paper. The data were rebinned such that each data point corresponds to a sigma-to-noise ratio > 3 for visualization purposes only (the analysis was performed on the unbinned spectra). The spectrum of the deepest observation (October 2000; upper left) is shown with a coarser binning (minimum signal-to-noise ratio >10) in Fig. 4.
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