Spectroscopic sequence of PS1-12bwh. All spectra have been corrected for redshift and galactic extinction. Epochs are given in days relative to an r-band maximum of MJD = 56 224.9. For clarity, spectra have been offset vertically with the zero point of each offset marked by a dashed line. Features due to telluric absorption, Fe iiiλ4404, Fe iiλ4555, Si iiλ6355, and C ii λ6580 are marked and narrow host emission lines have been removed. Gaps in the −2, + 27, and + 57 d spectra are due to the instrument configuration (Table A.2).