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Fig. 4
MUSE 1D spectra of the multiple images 8a and 8b. The vertical lines indicate the CIII] doublet emission wavelengths of a source at redshift 1.837. The small panels show the circles with 1″ (top) and 
(bottom) radius used to extract the two spectra. The flux is rescaled by a factor of 10-18 erg / s / cm2/Å.
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