MUSE integrated spectra corrected for variations in the velocity field of galaxy ID 473 (upper panel), its tail (upper middle panel), galaxy ID 345 (lower middle panel), and its tail (lower panel). The associated standard deviation, which is shifted below zero for clarity, is shown in grey. The main lines at the redshift of the sources are indicated with grey dotted vertical lines. An emission around 7500 Å associated with a background [O II] emitter is observed in the spectra of ID 473’s tail. Fluctuations in the spectra of the tails are due to imperfect bright-star continuum subtraction and faint background sources.
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