Prime-time ratings compiled by Nielsen Media Research for February 7-13. Top 20 listings include the week's ranking, with rating for the week and season-to-date rankings in parentheses.

An ``X'' in parentheses denotes a one-time-only presentation. The rating is the percentage of the nation's estimated 100.8 million TV homes. Each ratings point represents 1,008,000 households.

1. (4) ``ER,'' NBC, 20.9, 21.1 million homes.

2. (1) ``Who Wants to be a Millionaire-Tuesday,'' ABC, 19.2, 19.4 million homes.

3. (3) ``Who Wants to be a Millionaire-Sunday,'' ABC, 17.8, 17.9 million homes.

4. (2) ``Who Wants to be a Millionaire-Thursday,'' ABC, 17.7, 17.8 million homes.

5. (6) ``Friends,'' NBC, 15.4, 15.5 million homes.

6. (8) ''60 Minutes,'' CBS, 14.9, 15.0 million homes.

7. (5) ``Frasier,'' NBC, 14.1, 14.2 million homes.

8. (12) ``CBS Sunday Movie: Sally Hemings American Scandal Part One,'' CBS, 13.5, 13.6 million homes.

9. (30) ``ABC Monday Night Movie: Mary and Rhoda,'' ABC, 13.3, 13.4 million homes.

10. (15) ``The Practice,'' ABC, 12.9, 13.0 million homes.

10. (9) ``Touched by an Angel,'' CBS, 12.9, 13.0 million homes.

12. (X) ``Frasier,'' NBC, 12.5, 12.6 million homes.

12. (15) ``Law and Order,'' NBC, 12.5, 12.6 million homes.

14. (12) ``Jesse,'' NBC, 11.8, 11.9 million homes.

15. (20) ``Dharma & Greg,'' ABC, 11.5, 11.6 million homes.

16. (23) ``Providence,'' NBC, 10.9, 11.0 million homes.

17. (38) ``Dateline NBC-Tuesday,'' NBC, 10.7, 10.8 million homes.

17. (37) ``The Simpsons,'' Fox, 10.7, 10.8 million homes.

19. (10) ``Everybody Loves Raymond,'' CBS, 10.6, 10.7 million homes.

20. (19) ``Judging Amy,'' CBS, 10.5, 10.6 million homes.