def _mdtraj_summary(wizard, context, result):
    """Standard summary of MDTraj CVs: function, atom, topology"""
    cv = result
    func = cv.func
    topology = cv.topology
    indices = list(cv.kwargs.values())[0]
    atoms_str = " ".join([str(topology.mdtraj.atom(i)) for i in indices[0]])
    summary = (f"  Function: {func.__name__}\n"
               f"     Atoms: {atoms_str}\n"
               f"  Topology: {repr(topology.mdtraj)}")
    return [summary]