Additional sheath: Second part of a wall composed by two zones (carcass + sheath).
OW: Outer wall.
SW: Single wall.
Type of additional sheath (OW/SW) | |_ Type of microporous sheath (OW/SW) {None , Mesh} | |_ Type of mesh (OW/SW) {None , Microporous sheath} | |_ Repartition of bracts on additional sheath (OW/SW) {None , Mesh}