ice_gfstol.html">cspice_gfstol</a>, e.g.

      <a href="cspice_gfstol.html">cspice_gfstol</a>( tolerance value in seconds )

   Call <a href="cspice_gfstol.html">cspice_gfstol</a> prior to calling this routine. All subsequent
   searches will use the updated tolerance value.

   Setting the tolerance tighter than SPICE_GF_CNVTOL is unlikely to be
   useful, since the results are unlikely to be more accurate.
   Making the tolerance looser will speed up searches somewhat,
   since a few convergence steps wi