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Prime-time viewership numbers compiled by the Nielsen Co. for Oct. 12-18. Listings include the week's ranking, with viewership for the week and season-to-date rankings in parentheses. An "X" in parentheses denotes a one-time-only presentation.

1. (1) "NCIS," CBS, 21.04 million viewers.

2. (2) NFL Sunday Night Football: Chicago at Atlanta, NBC, 18.17 million viewers.

3. (4) "Dancing With the Stars," ABC, 16.79 million viewers.

4. (3) "NCIS: Los Angeles," CBS, 15.38 million viewers.

5. (7) "CSI: Crime Scene Investigation," CBS, 15.38 million viewers.

6. (7) "The Mentalist," CBS, 15.08 million viewers.

7. (15) "60 Minutes," CBS, 14.32 million viewers.

8. (12) "Two And a Half Men," CBS, 14.17 million viewers.

9. (19) "Dancing With the Stars Results," ABC, 13.96 million viewers.

10. (9) "Criminal Minds," CBS, 13.92 million viewers.

11. (5) "Grey's Anatomy," ABC, 13.79 million viewers.

12. (12) "Desperate Housewives," ABC, 13.68 million viewers.

13. (6) "House," Fox, 13.5 million viewers.

14. (15) "CSI: New York," CBS, 13.4 million viewers.

15. (12) "CSI: Miami," CBS, 13.27 million viewers.

16. (18) "The Big Bang Theory," CBS, 13.07 million viewers.

17. (15) "The Good Wife," CBS, 12.98 million viewers.

18. (11) "Sunday Night NFL Pre-Kick," NBC, 12.0 million viewers.

19. (20) "Survivor: Samoa," CBS, 11.78 million viewers.

20. (24) "The Amazing Race 15," CBS, 10.92 million viewers