Continuum Fitting for Quasar Spectra: A Case Study with Varying Wavelength Regions

Firstly, for each spectrum, we initially adopted the wavelength regions specified by Gibson et al. (2009), namely 1250-1350, 1700-1800, 1950-2200, and 2650-2710 Å. By iteratively fitting the continuum within these wavelength regions, we obtained a power-law continuum fit for each spectrum. Subsequently, we adjusted the wavelength regions by carefully checking the matching effectiveness between each power-law continuum and its corresponding initial spectrum. Therefore, the wavelength regions used for fitting the power-law continuum vary for each quasar. For instance, for Q3, we employed the following regions: .... For Q..., we utilized the following regions: ....