Before revision:  The basic reproductive factor, averaged over France, was R_0= 3.4\pm0.1 before the lockdown and 0.65\pm0.04 (90\% c.l.) during it, both with small regional variations.
After revision:  The basic reproductive factor, averaged over France, the analysis yields R_0= 3.4\pm0.1 before the lockdown and 0.65\pm0.04 (90\% c.l.) during it, both with small regional variations.