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Fig. A.1
Spectra taken at Loiano with the red grism covering approximately from 6200 to 7200 Å. The spectra have been Doppler shifted to λ0 and normalized to the flux in the interval 6400–6500 . The vertical broken lines mark the rest-frame position of [NII]λ6549; Hαλ6563;[NII]λ6584; [SII]λ6717, [SII]λ6731.
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