yfixed
      %            coordinates to planetographic
      %            coordinates.
      %
      % Look up the radii for Mars.  Although we
      % omit it here, we could check the kernel pool
      % to make sure the variable BODY499_RADII
      % has three elements and numeric data type.
      % If the variable is not present in the kernel
      % pool, <a href="cspice_bodvrd.html">cspice_bodvrd</a> will signal an error.
      %
      body = 'MARS';
      radii = <a href="cspice_bodvrd.html">cspice_b