def METHOD_NAME(get_fn, periodic, opt):
    # Test triclinic case where simple approach in Tuckerman text does not
    # always work
    ext_ref = np.array([17.4835, 22.2418, 24.2910, 22.5505, 12.8686, 22.1090,
                        7.4472, 22.4253, 19.8283, 20.6935]) / 10
    traj = md.load(get_fn('test_good.nc'), top=get_fn('test.parm7'))
    pairs = [[0, 9999]]
    time_pairs = [[0, 2]]
    r_t, g_r_t = md.compute_rdf_t(traj, pairs, time_pairs, 
            self_correlation=False, periodic=periodic, opt=opt)