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Fig. 3.7. Magnification of dense input areas. Whereas in Figure 3.6 the inputs were uniformly distributed over the receptor surface, map (a) was trained with inputs appearing more frequently in the middle, and map (b) with two such high-density areas diagonally from the middle. More units are allocated to representing the dense areas, which means that they are represented more accurately on the map. Similar magnification is observed in biological maps.