Figure 4:

Data fitting and simulation results for Hubei province: (a) Data fitting for the cumulative confirmed cases using both the direct and indirect transmission routes, from January 23, 2020 (day 1) to February 11, 2020 (day 20). The circles denote the reported cases and the solid line denotes the fitting result. (b) Simulation for the cumulative confirmed cases based on data fitting from part (a), for a period of 80 days from February 12, 2020 (day 1) to May 1, 2020 (day 80). The transmission rates are constants in the simulation. (c) Data fitting for the cumulative confirmed cases using the direct transmission routes only, from January 23, 2020 (day 1) to February 11, 2020 (day 20). (d) Simulation for the cumulative confirmed cases based on data fitting from part (c), for a period of 80 days from February 12, 2020 (day 1) to May 1, 2020 (day 80). The transmission rates are constants in the simulation.