A check on the relative flux calibration of the PESSTO spectra. The difference between the synthetic photometry colours of SN 2009ip (Gr#11) and SN 2013ai (Gr#13) and photometric measurements is plotted on the y-axis. The x-axis is simply the V-band photometric magnitude on the left panel and photometric colour (either B − V or V − R) on the right.
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