Maximum light spectrum of PS1-12bwh compared to SN 2012Z at the same epoch and to SN 2005hk a day earlier. All spectra have been corrected for redshift and extinction, and have been rebinned to the same resolution (Δλ = 3 Å). SNe 2005hk and 2012Z have been offset vertically from PS1-12bwh for clarity, with the zero level of each offset marked by dashed lines. Phases are given relative to the r-band maximum. The shaded areas highlight wavelength regions containing features with comparable strengths and shapes in the spectra of PS1-12bwh and SN 2005hk, but not SN 2012Z. PS1-12bwh at + 2 d appears to be qualitatively more similar to the pre-maximum SN 2005hk spectrum, than to the SN 2012Z spectrum at the same epoch. Data sources are listed in Table A.3.