According to the A.C. Nielsen co., here are the top 10 shows for the week ending Dec. 8, their networks and ratings. (Each rating poing equals 970,000 homes.)1. Seinfeld
NBC, 16.9
2. ER
NBC, 16.4
3. Movie: Mrs. Santa Claus
CBS, 14.7
tie Men Behaving Badly
NBC, 14.7
5. Home Improvement
ABC, 14.4
6. Friends
NBC, 14.3
7. Barbara Walters Special
ABC, 14.2
8. Movie: Home Alone 2
Fox, 13.8
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9. Monday Night Football
ABC, 13.6
10. NYPD Blue
ABC, 13.3