X constant M_2_PI
              </p>
            </td>
</tr>
<tr>
<td>
              <p>
                one_div_root_pi
              </p>
            </td>
<td>
              <p>
                1/√π
              </p>
            </td>
<td>
              <p>
                0.564189
              </p>
            </td>
<td>
            </td>
</tr>
<tr>
<td>
              <p>
                two_div_root_pi
              </p>
            </td>
<td>
              <p>
                2/√π
            