NLS1s exhibit a larger than previously thought dispersion in their spectral continuum slopes in the X-ray energy range. This large diversity is found in the strength of the soft excess in the soft energy range, as well as in the underlying power-law in the hard energy range. The steepness of the slope in both energy bands correlates with the width of the optical emission lines, especially with the FWHM of the H^ line. In Fig. 22.3 (left panel), the correlation between the steepness of the spectral energy distribution in the soft energy range and the FWHM of the H^ line is shown. Fig. 22.3 (right panel) gives the relation between the slope of the power-law in the hard energy range and the FWHM H^ line width.
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