We use circles and boxes to represent internal and terminal nodes, respectively

<p><b>Copyright information:</b></p><p>Taken from "A genome-wide tree- and forest-based association analysis of comorbidity of alcoholism and smoking"</p><p></p><p>BMC Genetics 2005;6(Suppl 1):S135-S135.</p><p>Published online 30 Dec 2005</p><p>PMCID:PMC1866801.</p><p></p> Under each internal node is the covariate that is used to split the node

SIF result for random network after concatenating 1 and 2 adjacent Delaunay triangles, when <i>N</i> = 9.

<p>(A) Concatenation of 1 Delaunay triangle. (B) Concatenation of 2 Delaunay triangles.</p

MST topology by Matlab for Butterfly network.

<p>MST topology by Matlab for Butterfly network.</p

The relative error percentage: .

<p>The relative error percentage: .</p

The network topologies of Case 15 after concatenating 1 to 3 adjacent Delaunay triangles.

<p>(A) Concatenation of 1 Delaunay triangle. (B) Concatenation of 2 Delaunay triangles. (C) Concatenation of 3 Delaunay triangles.</p

The MST topology for Case 9 by Matlab.

<p>The MST topology for Case 9 by Matlab.</p

The ESMT topology for Case 9 by GeoSteiner.

<p>The ESMT topology for Case 9 by GeoSteiner.</p

The network topologies of Butterfly network after concatenating 1 and 2 adjacent Delaunay triangles.

<p>(A) Concatenation of 1 Delaunay triangle. (B) Concatenation of 2 Delaunay triangles.</p