Si-region spectra of high-hardness (left panel, black) and low-hardness (right panel, blue) periods. Lines identified in the spectra are indicated and labeled. Residuals to the best-fit model are shown in black/blue, and residuals to a power law without the narrow line components are shown in orange. Spectra normalized to their respective power-law continua and reference lab measurements are shown in Fig. 6.
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