From top to bottom: 1D extracted spectra of five VANDELS LBGs at redshift z ~ 4 with different quality flags: VANDES-CDFS-226606 with QF = 4, VANDELS-UDS-012992 with QF = 3, VANDELS-UDS-384986 with QF = 2, VANDELS-UDS-305866 with QF = 1, and VANDELS-CDFS-029443 with QF = 9. The spectra of the QF = 1 and 2 galaxies have been slightly smoothed to show the absorption lines better.
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