Fig. 4
Expanded region of the Hβ line of the source SDSS150245.36+ 405437.2 (magenta line) which shows an extremely narrow line and the highest value of RFe. Fit components: total flux (black line), starlight (blue line), power law (green dashed line), and total line contribution (red line). The lower magenta line shows the shape of the Fe II template d11-5-m20-20-5-mod broadened with a Gaussian of 700 km s−1.
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