1 sets up to mark the person straight up (right in front) 2 and 3 set up 45% and behind the person marking in order to take away the middle of the field. 4, 5, 6 are covering the middle of the field. 7 is called the "deep" or "monster" and is covering anyone who may go deep.
If the disc gets swung to the sideline (5), (2) will become the mark (TALK TO EACH OTHER) and force the disc toward the middle 1 and 3 will take the middle of the field away
If the disc is on the other side (3) will be taking over on the mark, forcing them to throw it back to the middle and (1) and (2) will be taking the middle of the field away.
the middle row's job is to take away anyone coming into the middle space (4) takes away the left side
(5) takes away the middle space
(6) takes away the right side
(7) takes away anyone that is going deep.