Fig. 1.
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Example of the fitting procedure for the spectra of the FSRQ sample. The source is 5BZQ J1520+0732 (SDSS J152045.54+073230.5). Top panel: The observed spectra (blue), the final fit (black), and the power-law continuum (red). Middle panel: Spectral components fitted (excluding the continuum), including the broad Gaussian component (green), the narrow Gaussian component (orange), and the fitted Fe II emission (blue). Bottom panel: Residuals from the fit.
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