serif;">Additionally, C
versions bring<br>
      </span>
      <ul>
        <li><span style="font-family: ms sans serif;">A common header <span style="font-weight: bold;">atmodels.h</span> for all the models,
except MSIS.</span></li>
        <li><span style="font-family: ms sans serif;">A model specific
header (like jac70.h, jac77.h or lafon.h, for instance). </span></li>
      </ul>
      <span style="font-family: ms sans serif;">
      </span>
      <table style="text-align: left; width: 800px;