LBT/LUCI spectra (gray line, black lines are rebinned spectra) of the 15 observed targets listed in Table A.1. Identifiers are annotated and spectroscopic redshifts are shown when they could be reliably measured. In such cases, the main emission and absorption lines are shown with vertical dashed, and dotted lines, respectively. Spectral regions contaminated by bright sky lines are marked with dark gray vertical bands. Spectral features expected at the optical redshift provided by zCosmos-deep spectrum, when available (see Table A.1), are shown as red vertical dashed lines and annotated.