Fig. 3
Top: Gaussian fit (blue) to the narrow Lyα emission revealed by the associated DLA toward SDSS J1256+3506. Center: the narrow Lyα emission is subtracted, and a quasar continuum template (green) is fitted to the spectrum. Bottom: the spectrum is normalized and the H i column density is fitted (yellow). SDSS J1256+3506 has log N(H i) = 22.1. The dashed red line marks the DLA redshift, and the solid vertical yellow line indicates the velocity offset for the quasar.
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