def brunt_index_correct_range(alpha_low, alpha_up):
    """
    Upper and low error ranges. See `brunt_index_correct`.
    """
    return (1.52 - 0.18) * alpha_low - (0.19 + 0.2), (1.52 + 0.18
        ) * alpha_up - (0.19 - 0.2)
