​
effective infection rate
in group 1 (λ
1
)
0.5
in group 2 (λ
2
)
2
0
20
40
60
80
100
0.0
0.1
0.2
0.3
0.4
0.5
mixing (%)
fraction of infected individuals in groups ρ
1
and ρ
2
and in the total population ρ
pop
ρ
2
ρ
pop
ρ
1