s routine.
 
   5) If the specified aberration correction is not recognized, the
      error will be diagnosed and signaled by a routine in the call
      tree of this routine.
 
   6) If insufficient ephemeris data have been loaded prior to
      calling <b>illum_plid_pl02</b>, the error will be diagnosed and signaled by a
      routine in the call tree of this routine. 
 
   7) If a DSK providing a DSK type 2 plate model has not been
      loaded prior to calling <b>illum_plid_pl02</b>, the error will be
