1D and 2D FIRE spectra Top: Five hours of combined 2D spectra centered around the Lyα line. Bottom: Extracted 1D spectra. We sum all the flux within the columns. We also plot the expected positions of the [OII] and CIII] doublets to show that these lines are not the origin of the observed double peak. Left: Spatial profile of the emission line. We integrate the flux within the shaded region. We also plot only flux integrated blueward (blue) and redward (red) of 9635 Å.