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Table 1 Relationship between the number of clusters found and the number of SOM map units used

From: Protein structure search and local structure characterization

SOM map size Number of clusters SOM map size Number of clusters
10 × 10 6 110 × 110 24
20 × 20 9 120 × 120 19
30 × 30 10 130 × 130 21
40 × 40 12 140 × 140 22
50 × 50 15 150 × 150 18
60 × 60 13 160 × 160 15
70 × 70 14 170 × 170 21
80 × 80 18 180 × 180 18
90 × 90 18 190 × 190 18
100 × 100 20 200 × 200 18
  1. Our analysis determined that among the number of clusters that maximized the BIC, 18 clusters occurred most frequently. Thus, we assigned 18 letters to our alphabet.