Fig. B.1.

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Analysis of the [OIII]5007 line in the spectra of ID 100013704 excluding the presence of a broad component. Left panels: medium (top) and high (bottom) resolution spectra of ID 10013704 (candidate to host a dual BLR), zoomed around the [OIII]5007 line. The dashed lines indicate the Gaussian components used to fit the Hα profile, rescaled so that the narrow component matches the flux of [OIII]. The right panels show the same spectra, where the [OIII] (narrow) profile has been subtracted. Clearly, there is no [OIII] counterpart of the Hα broad components.
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