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There’s no slowing down Fox’s “American Idol,” whose Wednesday results show delivered the best numbers for the series this season, according to preliminary nationals from Nielsen. The net’s shows that surround “Idol” – “That ’70s Show” and “Simple Life 3” – also performed very well.

At 9, the selection of its 12 finalists propelled “American Idol” to Wednesday highs (11.7 rating/28 share in adults 18-49, 26.6 million viewers overall), up 14% week-to-week and topping ABC’s second-place “Alias” by a huge 19 shares in adults 18-49. “That ’70s Show” (4.3/12 in adults 18-49, 9.3 million viewers overall) pitched in with its best rating in 10 months, and “The Simple Life 3” also hit highs (6.5/16 in adults 18-49, 13.7 million viewers overall).

ABC placed second on the night, receiving nearly identical scores from a repeat of “Lost” (4/11 in adults 18-49, 12.1 million viewers overall), an original “Alias” (4/10 in adults 18-49, 9.9 million viewers overall) and a special “Primetime” (3.9/10 in adults 18-49, 10.6 million viewers overall).

CBS was paced by a repeat “CSI: NY” (3.8/10 in adults 18-49, 11.2 million viewers overall), NBC by a repeat “Law & Order” (3.6/10 in adults 18-49, 11.9 million viewers overall).

And it was another good night for UPN’s “America’s Next Top Model” (2.3/6 in adults 18-49, 5 million viewers overall), which tied “Lost” for second in adults 18-34 (2.9/9).

Preliminary adults 18-49 averages for the night: Fox, 6.8/18; ABC, 4/10; CBS, 3.0/8; NBC, 2.9/8; UPN, 1.6/4; WB, 0.9/2.

In total viewers: Fox, 15.1 million; ABC, 10.8 million; CBS, 9.7 million; NBC, 9.5 million; UPN, 3.6 million; WB, 2.3 million.