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for 
(from bottom to top) in homogeneous networks.
(The green dotted vertical line) the theoretical solution 
; (the blue short dashed line) the cost of vaccination; (the red dashed lines) the cost of treatment; and (the black solid lines) the total cost. Parameters are set as 
, 
, and 
. The basic per capita cost is set as 
and the vaccine efficacy is 
.
