Fig. 2.
Integrated spectrum of source SDSS J0923+0247. Top panel: the observed data is shown in light yellow with error bars in grey (rms in each channel). The red solid curve is the best-fit Gaussian model. The velocity scale (top axis) has as its referecence the central frequency of the best fit. Bottom panel: the fit residuals (model-data), the grey filled area shows the rms along the spectral axis.
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