Comparison between SEDM spectra (in blue) with other higher resolution instruments. Legends in each panel present: in blue the target name, redshift and phase of the SEDM spectrum; in color (orange and/or green), the other facility name and the phase difference with respect to the SEDM spectrum. For readibility, the x-axis of each sub-panel is aligned with the zero of the corresponding y-axis. Facility names: NTT (New Technology Telescope, ePESSTO, see Smartt et al. 2015, http://www.pessto.org), LT (Liverpool Telescope JMU; SPRAT Piascik et al. 2014), DUP (LCO-duPont ; WFCCD), P200 (Palomar 200-inch Telescope; Double Spectrograph), Keck (Keck Telescope; LRIS), NOT (Nordic Optical Telescope; Alhambra Faint Object Spectrograph and Camera). For visibility P200 spectra have been smoothed by a five-bin Gaussian filter.