Table 2. Degree of imbalance as a function of total number of inversions.

# inv	79	80	81	82	83	84	85	86	87
B. mean	0.128	0.133	0.135	0.137	0.139	0.144	0.143	0.149	0.156
B. sd	0.115	0.122	0.125	0.128	0.131	0.139	0.133	0.142	0.135
KS p	<2e-16	<2e-16	2e-5	0.02	0.008	0.18	0.22	0.27	-
KS D	0.016	0.010	0.007	0.008	0.017	0.020	0.037	0.105	-
N	11492	11395	4775	1661	498	130	38	10	1
Bpp	0.383	0.379	0.159	0.055	0.017	0.004	0.001	<0.001	<0.001

The posterior estimate of the mean degree of imbalance (B. mean) and associated standard deviations (B. sd) are given for inversion histories of length ranging from 79 to 87 (# inv). For each successive pair of inversion counts, the distribution of balance values for genomic arrangements was compared using a Kolmogorov-Smirnov (KS) test, with p-values and D-values reported as KS p and KS D. N gives the number of samples and Bpp gives the total amount of Bayesian posterior probability for each inversion history length. From the data we conclude that parsimonious histories (79 events) have better-balanced genome arrangements, but the difference is small (KS D) even though it is statistically significant.