Na I λ8200 doublet detail for some of the particular sources (all but LOri115 discarded as members) with CAFOS spectra. For each case, we have overplotted in red a confirmed member with the same spectral type, and in blue a field dwarf (again with the same spectral type and obtained in the same campaign). Note that for spectral types M4.75 and M5.25, we have averaged spectra of field dwarfs with spectral types M4.5 and M5.0, M5.0 and M5.5, respectively.