Left: comparison between the observation of SN 2006jc on the 14th of October 2006, 14 d after the estimated time of maximum at MJD= 54 008, with the spectrum from a CDS whose mass and composition are based on model he4p0, placed at a radius of 2 × 10¹⁵ cm, moving at a velocity of 2000 km s⁻¹ and powered at a rate of 6 × 10⁴² erg s⁻¹. Right: same as left but now for the observations of SN 2006jc on 23rd of November 2006, 54.6 d after the estimated time of maximum, and for the same he4p0 model in a CDS at 6 × 10¹⁵ cm, moving at a velocity of 2000 km s⁻¹ and powered at a rate of 2 × 10⁴² erg s⁻¹. In both panels, the observations have been corrected for reddening (E(B − V) = 0.04 mag) and redshift (z= 0.005574). The model is normalized to the observations at 5300 Å (left panel) and at 5800 Å (right panel). Models and observations are smoothed with a Gaussian kernel (FWHM of 23.5 Å).