Figure 4.

Left: bar-plots showing the relative frequencies of genomic distances (δ_ij) for the significant interactions using Fisher's exact test (red bars) and the NCHG test (blue bars), divided into 10 groups of genomic distances. Right: fraction of significant interactions, relative to all possible interactions, plotted against the number of observed interactions n_ij. Red circles indicate results using Fisher's exact test, while blue circles indicate results using the NCHG test. Results for K562 (top panels) and Mcf7 (bottom panels) are shown.