Observed r-band (g-band in the cases of iPTF14gaq, iPTF15dqg, iPTF16asu, and iPTF16gox) fluxes from PTFIDE minus the zero-flux level (baseline) as a function of time since explosion for all of the SNe with derived explosion epoch and data available a few days before explosion. The inset gives a close-up view of the time range between −10 and +10 d. No pre-rise excess is observed between −10 and +0 d. Colors and symbols as in Fig. 21. A moving mean over 20 points and its enveloping standard deviations are marked by thick solid red lines, and it is consistent with zero flux.