Figure 3. Comparison of optimal allocations of vaccines with target vaccination in uncorrelated scale-free networks.
Optimal allocation 
(a), 
(d), and 
(g) for 
(left column); optimal allocation 
(b), 
(e), and 
(h) for 
(center column); target allocation 
(c), 
(f), and 
(i) (right column). At equilibrium, the fractions of infected nodes are 
(
), 
(
), and 
(target vaccination), respectively. The total costs for the optimal allocation are 
(
), 
(
), 
(
for target vaccination), and 
(
for target vaccination). 
and the maximal vaccination coverage is 
. The degree distribution is generated with 
and the network size 
. The minimal degree is 
and the maximal degree is 
. Nodes are grouped into 30 groups.