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Fig. A.1

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Sample host contamination simulations results. For every simulated spectrum the final fractional error is calculated (fractional error is used so that all templates of different epoch and subtypes can be added and analysed as function of contamination). The panels show the distribution of errors, divided into four contamination bins (0−17.5, 17.5−35, 35−52.5 and 52.5−70% in g band). The average contamination, average error and Population RMS (Prms) is printed for each bin. The average error (shown as dashed orange line) indicates a small bias, decreasing with contamination. The dispersion indicates a random error from host subtraction, increasing with contamination. These plots are based on pEW f3; other pEWs show similar results.

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