Fig. A.1
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BMU distance histograms for SOM sizes of 5 × 5, 10 × 10, and 20 × 20 neurons. These histograms show the distribution of Euclidean distances between a YSO image and its corresponding best-matching unit for all source images in the training sample. From left to right, the panels show the distribution of BMU distances for increasing SOM sizes. The red vertical line indicates the position of the peak of the distance distribution.
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