625831.fig.001a
(a)
625831.fig.001b
(b)
Figure 1: (a) The West African domain sizes and (b) topography (in meters). The analyzed domain for quantitative assessment extends from 20°W to 20°E and 0 to 20°N in red. The highlands are highlighted by their respective acronyms: Guinea Highlands (GH), Jos Plateau (JP), Cameroun Mountains (CM), and Sudanese Highlands (SH).