  We revisit the spectra observed by Ramos Almeida et al. (2013) from an
homogeneous sample of galaxies at 0.27<z<1.28 with the aim of finding out the
characteristics of the single objects by consistent modelling. In particular we
investigate the trend of the most significant physical parameters and of the
element abundances with redshift. The observed corrected line ratios cover a
relatively large range. Nevertheless the calculated physical conditions are
similar to those of active galactic nuclei and of starburst galaxies. For some
of the galaxies the dominant photoionizing source is ambiguous. The N/H and O/H
relative abundances are close to the solar ones but show a dip at z=0.7.
