Fig. 10.

Comparison of the B − V (left) and g − r (right) colour evolution in SN 2017cbv (black points) to models with (coloured lines) and without 56Ni shells (grey lines) in the outer ejecta. A model with an extended 56Ni distribution relative to our fiducial SN 2017cbv model is shown as a dashed line. The epochs of our spectral comparisons are shown as vertical dotted lines.
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