+ std::cout << " <size>" << size << "</size>" << std::endl;
+ std::cout << " <depth>" << std::endl;
+ std::cout << " <max>" << max_depth << "</max>" << std::endl;
+ std::cout << " <leaf-avg>" << tot_depth / ((double) n_depths) << "</leaf-avg>" << std::endl;
+ std::cout << " </depth>" << std::endl;
+ std::cout << " <width>" << std::endl;
+ std::cout << " <max>" << max_children << "</max>" << std::endl;
+ std::cout << " <inner-avg>" << tot_width / ((double) widths.size()) << "</inner-avg>" << std::endl;
+ std::cout << " </width>" << std::endl;