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Fig. 4.

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Contour plot of the broad Gaussian line width (keV) versus its rest-frame energy (keV). The red, green, and blues curves show the confidence levels at 68% (Δχ2 = 2.3), 90% (Δχ2 = 4.61) and 99% (Δχ2 = 9.21), respectively. The horizontal dashed green line corresponds to an FWHM width of ∼3000 km s−1 (BLR).

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