public SimpleTree simulateTree(TaxonList taxa,DemographicModel model){
  return simulator.simulateTree(taxa,model.getDemographicFunction());
}

public SimpleTree simulateTree ( TaxonList taxa , DemographicModel model ) { return simulator . simulateTree ( taxa , model . getDemographicFunction ( ) ) ; }
simulates a coalescent tree , given a taxon list .
