But when the 10 biggest entertainment channels are singled out -- USA, TNT, Fox News, Nick at Nite, History, TBS, A&E, Discovery, ESPN and ABC Family -- they show a collective uptick of 5% compared with last summer, suggesting that there is a bit of consolidation going on. The 10 top cablers draw almost a third of all the viewers for the 90 ad-supported cable channels that are measured by Nielsen. Those channels also churn out most of TV's summer hits.
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