Fit of the modified radioactive decay model to the late-time full bolometric light curve of SN 2017ckj. In the left panel, the bolometric light curve fitting is shown by the red solid line, while the full γ-ray trapping model is presented in blue dashed-dotted line for comparison. The right panel presents the posterior distribution from MCMC sampling. The mean of the posterior distribution and 1σ uncertainties are marked.