def METHOD_NAME(self, run_number=0, system=None, out_stream=_DEFAULT_OUT_STREAM):
    """
    List model options for the specified run.
    Parameters
    ----------
    run_number : int
        Run_driver or run_model iteration to inspect.
    system : str or None
        Pathname of system (None for all systems).
    out_stream : file-like object
        Where to send human readable output. Default is sys.stdout.
        Set to None to suppress.
    Returns
    -------
    dict
        {system: {key: val}}.
    """
    pass