Fig. A.1
Spectra taken at Loiano with the blue and red grisms covering approximately from 4500 to 7500 Å. The spectra have been Doppler shifted to rest frame and normalized to the flux in the interval 6400–6500 Å. The vertical broken lines mark the rest-frame position of Hβ λ4861; [OIII] λ4958; [OIII] λ5007; [NII] λ 6549; Hα λ 6563; [NII] λ 6584; [SII] ~λ6717; [SII] ~λ6731.
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