Fig. 8
Spectral sequences for PTF09gpn, PTF12gcx, and PTF12kso. All spectra were calibrated against photometry and corrected for extinction. The main spectral lines, the dates, and the phases are reported. The absorption minimum of each line is marked by a red segment, the rest wavelength by a black segment. The zero-flux level is marked by a dashed horizontal line for each spectrum.
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