Mark connection functions. Mark connection function p
(s) for (a) genes and (b) operons. Analogously as in Figure 5, the full curves denote p11(s), the dotted curves p22(s) and the dashed curves p12(s). The functions show that the maxima in Fig. 5 result only from different frequencies of inter-point distances, while the probabilities of being isolated or regulated depend monotonously on the interpoint distance s.