Fig. 5

Solution-space hyperplane. Each axis shows the annual spending for each oblast, such that the total spending remains constant; the logarithmic color scale shows the ratio of the outcome for each possible inter-region allocation (here, the cumulative number of new HIV infections from 2016–2030), compared to the optimal inter-region allocation. In particular, outcomes are shown for the baseline allocation (circle) and the geographically-optimized allocation (star), indicating that the baseline inter-region allocation is already very close to optimal