Distributions of CO and NCO sizes (A), distance between COs (B), distance between NCOs (C), and distance between COs and NCOs (D). The sizes of gene conversion tracks associated with COs and NCOs were not significantly different (A). Sizes were defined by the closest markers where the defined allele changes were observed (Additional file 14: Figure S7, materials and methods). The ends of the whiskers represent 1.5 interquartile range of the lower/upper quartile. The distributions of all three types of distance fit well with Poisson distributions (B, C, D). The red circles and lines represent expected Poisson distributions that fit to the datasets, as determined by the method of least squares. The R square values were 0.93295, 0.93026, and 0.95587, respectively. Distance values were calculated based on the start positions of consecutive breakpoints.