      <ul>
        <li><span style="font-family: ms sans serif;">Static profile
(function of the exospheric
temperature and height)</span></li>
        <li><span style="font-family: ms sans serif;">Static density
(same as static profile, but
function of solar flux F10.7 and geomagnetic activity besides height).</span></li>
        <li><span style="font-family: ms sans serif;">Dynamic model.</span></li>
      </ul>
      <span style="font-family: ms sans serif;"> In order to make it
easy to remembe