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Fig. 4

image

Distributions of simulated SNe Ia (normal) interacting with a CSM with respect to the flux ratio fV. The objects classified correctly have larger fV ratios and the two distributions are statistically different at a high significance (p ~ 10-15 in a KS test). All spectra that were given a Ia-CSM designation have been considered to be correctly classified. The dashed line indicates that less than 16% of the simulated events were correctly (wrongly) classified at flux ratios below (above) fV = 0.3.

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