SEP and NOISE ratios. SEP (ΔJC)/SEP (ΔK2P) (dashed) and NOISE (ΔJC)/NOISE (ΔK2P) (dotted) plotted against t
for four series of homogeneous K2P quartets of type B. Top two series have ti-tv ratio of R =2, and bottom two series have ti-tv ratio of R =5. Left two series have external edge lengths t
=1 and t
∈[0.2,1], and right two series have external edge lengths t
∈[0.2,1] and t
=0.2. The length of the internal edge is constant t
=0.2 in all four series.