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Fig. 4

image

Zoom-in of the region occupied by the [O ii] emission line in the X-Shooter spectrum. Top: 2D spectrum. The circles mark the emission line and the negative features resulting from the nodding. Bottom: modeling of the spectrum obtained with GANDALF (magenta line) compared to the one-dimensional spectrum. The spectrum has been median filtered, flux-calibrated, and corrected for Galactic extinction. The [O ii] emission line is redshifted to 4516 Å (blue dashed line) in agreement with the redshift of 0.211 measured with the absorption lines only.

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