Figure 4.

Residual plots. Residual plots of internodal distances of each of four nuclear loci obtained from regression against RAG-1 internodal distances (independent variable) on MP tree reconstructed from combined data sets of 5 nuclear loci. (a, b), FGB7; (c, d), ADH5; (e, f), GPD3-5; and (g, h), myo-2. Note the higher variance of residuals in non-Charadriiformes (left panel) than Charadriiformes (right panel), indicating better correlation of estimates of internode lengths in the latter across all loci.

Fain and Houde BMC Evolutionary Biology 2007 7:35   doi:10.1186/1471-2148-7-35
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