Fig. A.3.
Cubic smoothing splines fit to our SN IIn light-curves, to determine the times and magnitudes of the light-curve peaks (Sect. 4.1). Photometric bands are specified in Table 6. The CSS fit is indicated by a blue curve and the peak of the light-curve is marked by a red dot. The smoothing parameter s for each SN is reported in Table 6. The SNe with peak-time error > 10 d (PTF10qwu, PTF10acsq, iPTF13cuf) have their estimated peaks marked with red crosses.
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