def branch_lines(self):
        exit_counts = self.parser.exit_counts()
        return [l1 for l1,count in iitems(exit_counts) if count > 1]
Generate a plot of the system tree and bring it up in a browser.
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/coverage/results.py/Analysis.branch_lines--crossover with--dataset/ETHPy150Open OpenMDAO/OpenMDAO/openmdao/devtools/dotgraph.py/plot_sys_tree