Table S18. Properties of intergenic regions. 

Feature	Alternat-ively fragmented	Number	Mean (bp)	Min  (bp)	Max  
(bp)	%GC	
Unidirectional intergenic region	Yes	329	319	96	2,660	20.4	
	No	561	381	92	3,197	23.1	
Convergent intergenic region	Yes	300	249	63	1,598	20.3	
	No	471	229	53	1,945	20.2	
Divergent intergenic region	Yes	149	320	96	2,660	20.4	
	No	260	330	132	1,555	23.0