Fig. A.1.
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Comparison of the quality of fit of the Fe IIcons lines with a single-Gaussian and two-Gaussian model (ILR+VBLR). On the Y-axis is the normalised difference between χ2 of fit of Fe IIcons with a single-Gaussian model (χ1G2) and two-Gaussian model (χ2G2). On the X-axis is the Fe IIcons width, estimated using single-Gaussian model (FWHM Fe II1G).
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