One-third of a second.That's what separated Temple's Traci Westphal from a berth at last year's state swim meet. Remembering that is more than enough as she begins her final regional competition today."When you first get to region, it's such a high level of competition that the pressure swimmers will rise up and do the best," she said. "Last year was a huge meet for me. Now I know what it's all about."Westphal, a senior, is one individual among two contingents of Temple and Belton swimmers competing at the UIL's Region IV swim meet today and Saturday at UT-Austin's Jamail Swim Center.For today's preliminaries and Saturday's finals, the Class 4A competition will begin at 10 a.m., with the 5A to start at 4 p.m.Westphal will go in the girls 100- and 200-yard freestyle events, but thinks she stands a better shot of making it to state in the 200. She finished fifth at last year's regional, but her time