Bottom: UV/optical spectrum of the AGN SDSS04 observed by FORS2 at VLT. Top: a zoom of the blue side of the spectrum for AGN SDSS04. The red horizontal lines mark the zero level for the flux Fλ, in arbitrary units. The LyC region (at λ ≤ 912 Å rest frame) has been highlighted in blue. The associated RMS is shown by the green spectrum.
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