All selected features of the supervised and unsupervised POL-ε signatures in UCEC-TCGA are listed and their frequencies compared (IUPAC notations: B=not A, D = not C, H = not G, V = not T, W = A or T, S = C or G, M = A or C, K = G or T, R = A or G, Y = C or T). Different plots are provided according to the different numbers of patterns (i.e. rank) unsupervised NMF was required to find: (a – e) correspond to rank = 2, 3, 4, 5, and 6, respectively. The larger the rank the greater the difference of the unsupervised signature from the correct supervised one. See Materials and method section for details.