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Fig. 2.

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Optical and NIR de-reddened observed spectra of PSO J191+86 taken at TNG and LBT, respectively. The most important visible emission lines are marked. We masked the part of the MgII line that suffers from a strong absorption feature, in which the peak of the MgII line falls (shown here in gray). The top x-axis reports the rest-frame wavelengths while the right axis shows the monochromatic luminosity.

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