Same as Fig. 6 but for model ekin1p2_mdot0p1_rcsm2e14. All contributing lines are included in this figure, including He I at 6678.15 and He II at 6560.09 Å (this line dominates the emission seen at 2.0 d and remains a strong contributor at 2.5 and 3.0 d). This configuration with a more compact and denser CSM fosters a strong radiative acceleration of the unshocked CSM (causing the disappearance of the SN shock at all epochs shown), visible in the blue-shifted emission for the last two epochs (i.e., two bottom rows).