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Effect of (i) removing lockdown from day 21 (red curve), (ii) allowing the protection_level of days 21–38 to continue until day 60 (yellow curve), and (iii) the simulation of total cases (blue curve) are shown in (a). Contact tracing from day 21 (green curve) with 75% smartphone users results in fewer infections (with respect to the total population) compared to the blue curve by the end of day 60. Corresponding Rt curves are reported in (b)
