Multiepoch spectral comparison between SN 2012aw and our reference 1D CMFGEN model 1D-X1 (see Sect. 3.1). The data correspond to the observed total flux for SN 2012aw obtained with VLT–FORS in spectropolarimetric mode. The model is redshifted, reddened, and then normalized to the observed flux at 7000 Å. The V -band brightness offset, calculated from the observed photometry (Bose et al. 2013; corrected for distance and extinction) and the model photometry, is given for each epoch and is typically on the order of 0.1 mag. This model is named x1p5 in Hillier & Dessart (2019) and is our best match model for SN 2012aw.