unload</a> or
      <a href="cspice_kclear.html">cspice_kclear</a>. See the documentation of <a href="cspice_furnsh.html">cspice_furnsh</a> for limits on
      numbers of loaded DSK files.

      For run-time efficiency, it's desirable to avoid frequent
      loading and unloading of DSK files. When there is a reason to
      use multiple versions of data for a given target body---for
      example, if topographic data at varying resolutions are to be
      used---the surface list can be used to select DSK 