if( require(igraph, quietly = TRUE) ) {
set.seed(2992)
plot(EFnet, layout=layout.fruchterman.reingold,
vertex.color=V(EFnet)$type+1, vertex.label.family="",
sub="Source: Echenique & Fryer (2006)",
main="Neighborhood racial segregation\n in a fictional city" )
}
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