Optical (left panel) and NIR (right panel) spectra of SNe Ia obtained with X-shooter, FORS1, and ISAAC at the VLT, SOFI at the NTT, and GNIRS at Gemini-North. The spectra are arranged in epoch starting with the youngest at the top and corrected for redshift and extinction. Fluxes are normalized to the 7300 Å [Fe II] + [Ni II] feature (optical) and 12 600 Å [Fe II] feature (NIR). The red line indicates the mean flux of all fit models at each wavelength, the orange shaded area marks the 68% uncertainty of the fit. Dashed vertical lines indicate the strongest lines as given in Table 2 ([Fe II]: - - - -, [Ni II]: ⋯ ⋯⋯ [Co II]: —⋅—, [Co III]: — ⋅ ⋅— ⋅). The subtracted background is shown as a grey band. Fits were performed for the optical and NIR spectra at the same time. The lines/ions composing the features below 5500Å are not included in our fits.