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Fig. 1

image

Rest-frame spectrum of Sp1149 at the position S1 and its centre (SC), which have been smoothed over 9 pixels for illustrative purposes. For comparison, the red and blue composite GMASS spectra (Kurk et al. 2013) are also shown, which are normalized to the Sp1149 spectrum at 3000 Å. To avoid confusion, we added an offset of (− 25,25) × 10-20 erg s-1 cm-2 Å-1 to the central spectrum and the GMASS spectra, respectively. The error estimates are shown by the grey line, while the vertical grey bands are located at wavelengths with significant skyline contamination. The short black vertical lines show the wavelength of important Fe  and Mg  lines.

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