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a shows effects of tracing 75% of entire population (blue) as opposed to only the doctors, nurse, healthcare workers, and 50% service holders (red) from day 27. Both of these curves result from tracing the contacts of the previous 2 days. The yellow curve shows the effect of tracing 75% of the population for the previous day only. The shaded portion represents confidence interval. The means of their Rt curves are given in (b)
