Ni+CSM model lightcurves fitted to the photometry of SN 2020bqj using the Monte-Carlo code MOSF IT, with on the left the shell model (s = 0) and on the right the wind model (s = 2). A selection of lightcurves based on a random draw from the posteriors are plotted, to demonstrate the range of the model fit in each filter. The models are able to reproduce the flat plateau in the optical bands as well as the steady decline phase of the UV/optical. The rapid rise to the peak plateau of SN 2020bqj is less well reproduced, especially when taking into account the upper limits.