e values of the inverse tangent integral.
        </li>
        <li>
          <b>ARCTANH_VALUES</b> returns some values of the hyperbolic arc tangent function.
        </li>
        <li>
          <b>BEI0_VALUES</b> returns some values of the Kelvin BEI function of order NU = 0.
        </li>
        <li>
          <b>BEI1_VALUES</b> returns some values of the Kelvin BEI function of order NU = 1.
        </li>
        <li>
          <b>BELL_VALUES</b> returns some values of the Bell numbers for testing.
  