Main panel: fit quality as measured by the absolute Bayesian likelihood for the best-fitting template (ℒmax), versus P, the probability of a given source being of the simulated type, for the ~18 000 Monte-Carlo-simulated supernovae. The upper panel shows the P distribution and the right panel the ℒmax distribution. For clarity, large (blue) dots and solid (blue) lines marks the correctly typed SNe (with P > 0.5); small (red) dots and dashed (red) lines the incorrectly typed SNe. The cross and star symbols in the main panel show ℒmax and P(TN)/P(CC), respectively, for the observed supernovae (see Sect. 5). Three of the thermonuclear SN candidates have ℒmax < 1 × 10-14, they are marked by a caret lower limit symbol at ℒmax < 1 × 10-14 (note that they have the same P(TN) values, thus the symbols are overlapping) (this figure is available in colour in the electronic version of the article).
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