Before revision:  These models involve ratios of evolutionary timescales to branching fractions, assumed uniform throughout a country, and the basic reproduction number, R0 , before and during the national lockdown, for each region of France.
After revision:  These models involve ratios of evolutionary timescales to branching fractions, assumed uniform throughout a country, and the basic reproduction number, R_0 , before and during the national lockdown, for each region of France.