Fig. 3.

Depiction of examples showing the policy switching for the three groups. The top plot represents the benchmark simultaneous-release scenario in which all groups have restriction level $s_b$ for $T_0<t\le T_{end}$ and all groups have relaxed restriction level $s_r<s_b$ for $t>T_{end}$. The bottom diagram corresponds to one staggered-release scenario in which the times for policy switching are at $T_1$ and $T_{end}$: all groups have the restriction level $s_b$ for $T_0<t\le T_1$ and the level $s_r$ for $t>t_{end}$, but Group 1 has a relaxed level of restriction $s_2^{\left(1\right)}\in (s_r,s_b)$ for $T_1<t\le T_{end}$.