question: @ Override public void readExternal ( ObjectInput in ) throws IOException , ClassNotFoundException { super . readExternal ( in ) ; conservativeApproximation = ( ApproximationLine ) in . readObject ( ) ; progressiveApproximation = ( ApproximationLine ) in . readObject ( ) ; }
target:  Calls the super method and reads the the conservative and progressive approximation of the knn distances of this entry from the specified input stream.