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  • Areas with market potential as farm-gates sales inferred from population density (in individuals/km2 or i/km2). Population density was provided by the National Center for Geographic Information and Analysis (NCGIA) from the University of California at Santa Barbara.

  • Soil texture interpreted in terms of suitability for pond construction. Soil texture data was obtained from the FAO-UNESCO Soil Map of Africa at 1:5 million scale. This dataset includes three soil texture classes: coarse, medium and fine and these are given for the dominant soils of each association and refer only to the upper 30cm.