def shimizu_mirioka(XYZ, t, a=0.75, b=0.45):
    """
    The Shinizu-Mirioka Attractor.
    x0 = (0.1,0,0)
    """
    x, y, z = XYZ
    x_dt = y
    y_dt = (1 - z) * x - a * y
    z_dt = x**2 - b * z
    return x_dt, y_dt, z_dt