Figure 4.

${\beta }_{\mathrm{obs}}^{*}$, ${\gamma }_{\mathrm{obs}}^{*}$, $R_{0,\mathrm{obs}}^{*}={\beta }_{\mathrm{obs}}^{*}/{\gamma }_{\mathrm{obs}}^{*}$ deduced from the data from $t_0=19/03/2020$ to $T=20/05/2020$