def METHOD_NAME(rotor1):
    speed = np.linspace(0, 1000, 51)
    response = rotor1.run_freq_response(speed_range=speed)
    file = Path(tempdir) / "frf.toml"
    response.save(file)
    response2 = FrequencyResponseResults.load(file)
    assert response2.freq_resp.all() == response.freq_resp.all()
    assert response2.speed_range.all() == response.speed_range.all()
    assert response2.velc_resp.all() == response.velc_resp.all()
    assert response2.accl_resp.all() == response.accl_resp.all()