Fig. 8
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20 × 20 U-matrix of the same SOM given in Fig. 7 but exposed to a test data set. Having the correct class of the test data, we flagged the objects falling in each neuron with a different symbol and colour, and thus confirmed the capability of the (early stopped) SOM to classify a new data set. The meaning of the symbols and colours is as described in Fig. 7.
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