Fig. 7.
Stack of normalized spectra of the emission line objects. They are stacked in y-direction with increasing redshifts, with a large jump between z∼1.5 and z∼2.9. First we normalized the spectra to the brightest emission line, then we smoothed with a 10 Å Gaussian and finally we smoothed the 2D image with a 2.8 pixel 2D circular Gaussian.
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