Distributions of all the simulated normal and 91T-like SNe Ia interacting with a CSM and how these were classified depending on the flux ratio f_V. As f_V decreases (the contribution of the BB continuum increases), the SN features become more diluted and the SNe are progressively classified as Ia-CSM, IInS, and IIn. All distributions are mutually statistically incompatible. The difference between the Ia and the 91T distributions is explained by the fact that 91T-like events are brighter, on average, than normal SNe Ia (by 0.4 mag in this simulation). The figure zooms in f_V ≤ 2.