Multi-colour light curves corrected for host-galaxy extinction and afterglow-subtracted. Filled circles represent detections and arrows are upper limits. Solid lines represent the overall fits and dashed lines individual components. Fits of SN 1998bw templates are extrapolated from  ≈ t₀ + 60 d. For reasons of clarity, light curves were shifted along the magnitude axis and the systematical error in A_V,host was not added to the error bars.