Sensitivity profiles of rank r = 1 - 4 of different data sets (part a, see Table 2 in the methodical part) and the respective triple-related fit statistics: sum of squared residuals (part b, Eq. (8)), quality of fit (c, Eq. (13)) and standard error (d, Eq. (14)). Homo-motifs of consecutive A, C, G and T are shown by colored curves. The thin dotted lines indicate the basic trends of the poly-G and poly-C motifs at position k = 1 and 12, respectively. Note the different scaling of the ordinates in panels a and c.