@Override public void writeExternal(ObjectOutput out) throws IOException {
  super.writeExternal(out);
  out.writeObject(conservativeApproximation);
}

@ Override public void writeExternal ( ObjectOutput out ) throws IOException { super . writeExternal ( out ) ; out . writeObject ( conservativeApproximation ) ; }
calls the super method and writes the conservative approximation of the knn distances of this entry to the specified stream .
