 We adopt a one-parameter model of \phi _i' infections per cluster, dividing any daily count n_i into n_i/\phi _i' ' clusters', for 'country' i.
<fluency>  We adopt a one-parameter model of \phi _i' infections per cluster, dividing any daily count n_i into n_i/\phi _i' ' clusters', for 'country' i.
 We adopt a one-parameter model of \phi '_i infections per cluster, dividing any daily count n_i into n_i/\phi _i' ' clusters', for 'country' i.