Figure 3From: Mapping the capacities of fixed health facilities to cover people at risk of gambiense human African trypanosomiasisTravel time (or physical accessibility) to health facilities having capabilities for diagnosis of gambiense HAT [hours]. Physical accessibility was calculated through a cost-distance function. Travel cost was measured in time units, and the destinations were represented by health facilities having capabilities for HAT diagnosis (Figure 2A). The time-cost of travel was derived from a ‘friction’ layer for Africa[11].Back to article page