Nielsen Ratings/Season Four

Airdate	Episode click "show" for episode data	18—49 year-old rating	18—49 year-old share	18—49 year-old viewers (in millions)	Total viewers (in millions)	Fast Nationals rating	Fast Nationals share
09/21/09	Orientation / Jump, Push, Fall	2.8	7	3.70	6.10	3.65	5.5
09/28/09	Ink	2.5	7	3.30	5.72	3.60	5.0
10/05/09	Acceptance	2.4	6	3.17	5.50	3.30	5.0
10/12/09	Hysterical Blindness	2.4	6	3.17	5.50	3.50	5.0
10/19/09	Tabula Rasa	2.4	6	3.17	5.60	3.60	5.0
10/26/09	Strange Attractors	2.5	7	3.30	5.70	3.70	6.0
11/02/09	Once Upon a Time in Texas	2.5	6	3.30	5.90	3.80	6.0
11/09/09	Shadowboxing	2.3	6	3.04	5.30	3.40	5.0
11/16/09	Brother's Keeper	2.2	6	2.90	5.10	3.20	5.0
11/23/09	Thanksgiving	2.3	6	3.04	5.20	3.10	5.0
11/30/09	The Fifth Stage	2.3	6	3.04	5.40	3.50	5.0
1/4/10	Upon This Rock / Let It Bleed	2.2	5	2.90	4.90	3.15	4.5
1/11/10	Close to You	2.1	5	2.77	4.70	2.90	4.0
1/18/10	Pass/Fail	1.8	4	2.38	4.00	2.40	4.0
1/25/10	The Art of Deception	1.9	5	2.51	4.30	2.90	4.0
2/1/10	The Wall	2.0	5	2.64	4.40	2.70	4.0
2/8/10	Brave New World	2.0	5	2.64	4.40	2.80	4.0