 of transverse spin waves parallel
        and perpendicular to the $l$ direction [cm/s]:
    <br>$c_\parallel^2 = \frac{\gamma^2\Delta^2}{\chi_B} K,\qquad
        c_\perp^2 = \frac{\gamma^2\Delta^2}{\chi_B}(K-K'/2),\qquad
        c_\parallel^2/c_\perp^2\approx 4/3.$</td>
    </tr>
<tr><td><tt>he3_clpar(ttc, p)</tt>
    <br><tt>he3_clperp(ttc, p)</tt></td>
    <td>Same for longitudinal waves [cm/s]:
    <br>$C_\parallel^2 = \frac{\gamma^2\Delta^2}{\chi_B}(K-K'),\qquad
         C_\perp^2 = \frac{\gamma^2\Del