It is described as if the 3 gates lead to different parts of the park, which would have upset the geometrical symmetry of the formal gardens. This presumably forms a 'clean break' between the two.
This aerial image shows it quite clearly:
http://www.viamichelin.fr/viamichelin/fra/search/Cartes/-1.1...
(that link takes you to the map, you then need to click on 'satellite' to see the actual image)
Definitely lop-sided!