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Fig. 1.

image

Observed spectra from the different samples for two stars: 522459 from the VIMOS, FORS1.6, and FORS2.6 samples, and 5182741 from the FLAMES and FORS_MB samples. The spectra have been corrected for radial velocity and have been shifted to rest wavelengths. The position of the main Balmer (dashed), He I (dotted), and He II (dash-dotted) lines are indicated. The VIMOS spectrum of 522459 suffers from an inaccurate wavelength calibration blueward of 4300 Å.

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