Table 2.

Results of F₄ test

popO	popA	popB	popC	F4(A,O;C,B)	F4(B,O;C,A)
YRI	TIB	CDX	CHB	0.01255	0.01977
YRI	TIB	CDX	CHS	0.01019	0.02478
YRI	TIB	CDX	KOR	0.01333	0.01780
CEU	TIB	CDX	CHB	0.01063	0.02007
CEU	TIB	CDX	CHS	0.00957	0.02605
CEU	TIB	CDX	KOR	0.01238	0.01917
YRI	CDX	JPRK	CHB	0.01317	0.00911
YRI	CDX	JPRK	CHS	0.01818	0.00843
YRI	CDX	JPRK	JPT	0.00723	0.02230
YRI	CDX	JPRK	KOR	0.01119	0.01547
CEU	CDX	JPRK	CHB	0.01239	0.00734
CEU	CDX	JPRK	CHS	0.01838	0.00788
CEU	CDX	JPRK	JPT	0.00728	0.02052
CEU	CDX	JPRK	KOR	0.01150	0.01442
YRI	TIB	JPRK	JPT	0.00766	0.02798
YRI	TIB	JPRK	KOR	0.01241	0.02116
CEU	TIB	JPRK	JPT	0.00769	0.02849
CEU	TIB	JPRK	KOR	0.01267	0.02239

Note: population A (popA) and population B (popB) are two donate populations, population C (popC) is a target population who received gene flow, population O (popO) is an out group. Additional file 14: Figure S10C shows the model of F₄ test. The value of F₄(A,O;C,B) stands for the size of the common part of the two pathway A to O and C to B (labeled as l) on the tree weighted by the gene flow proportion α (labeled as αl), and similarly F4(B,O;C,A) equals (1-α)m. And the calculation of F₄ value noted in METHODS