Before revision:  The coefficients in the model are evaluated by fitting to empirical data for six US states: California, Louisiana, New Jersey, New York State, Texas, and Washington State .
After revision:  The coefficients in the model are evaluated by fitting to empirical data for six US states: California, Louisiana, New Jersey, New York State, and Texas. Together these states make up 43\% of the US population; some of these states appear to have handled their initial outbreaks well, while others appear to be emerging hotspots .