Extended Data Fig. 3: Absorption lines from neutral gas.
From: Star formation shut down by multiphase gas outflow in a galaxy at a redshift of 2.45
a,b, Observed spectrum (blue) and best-fit stellar model (red). c,d, Ratio of the observed spectrum to the stellar model (blue) and best-fit Gaussian components describing absorption by neutral gas (purple). The expected positions of the resonant lines (at the systemic velocity of the galaxy) are shown in grey, while the positions of the Balmer lines, which are only present in the stellar spectrum, are shown in green. The absorption by neutral gas is clearly blueshifted.
