Top panel: low (z < 0.6, in blue) and high (z ≥ 0.6, in red) redshift composite spectra around maximum light built from the VLT five year sample. A ± 1σ range is plotted. Individual spectra are color corrected (using SALT2 color law) and recalibrated. Residual host-galaxy lines have been removed. Middle panel: dispersion of the low (blue) and high (red) redshift composite spectra. Bottom panel: number of spectra entering the low (blue) and high (red) redshift composite spectra.
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