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SN 2002bo, a type Ia supernova in NGC 3190, is the first object of the European Supernova Collaboration (ESC). It was discovered on 09 March 2002 and is one of the earliest observed SNe. An almost complete set of spectra and photometry is available from 13 days before maximum B light until a few days after. An analysis using synthetic spectra is presented, focusing on the controversial issue of the reddening of SN 2002bo.