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(AP) -- The NCAA tournament's first full day has earned its highest television rating in 19 years.
 
The games Thursday on CBS, TBS, TNT and truTV averaged a 5.5 fast national rating and 12 share.

The networks say that was up 4 percent from 2012.
 
This is the third season of CBS and Turner's 14-year, $10.8 billion contract to televise every game of the tournament in its entirety, a change in approach that so far has been a ratings success.
 
Ratings represent the percentage of all homes with televisions tuned to a program.

Shares represent the percentage of all homes with TVs in use at the time.

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