Distribution of best-fitting reddening estimates for all the epochs of SN 2017eaw (blue bars) and the constructed KDE distribution (background shape). Dashed grey line at E(B − V) = 0.3 mag denotes the Galactic reddening towards NGC 6946 based on the Schlafly & Finkbeiner (2011) dust map, which sets the lower limit for the KDE. The green and grey curves show the Gaussian kernels for a single observation obtained by our setting and Silverman’s rule, respectively. A normalisation procedure was applied to the KDE histogram to obtain a better comparison. For more details on this supernova, see Sect. 4.4.