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KENNEDY SPACE CENTER, FLA. -- Still waving at spectators, the STS-112 crew heads for the Astrovan that will take them to Launch Pad 39B and Space Shuttle Atlantis. Liftoff is scheduled for 3:46 p.m. EDT. From left are Mission Specialists Fyodor Yurchikhin David Wolf, and Piers Sellers; Pilot Pamela Melroy; Mission Specialist Sandra Magnus; and Commander Jeffrey Ashby. Sellers, Magnus and Yurchikhin are making their first Shuttle flights. STS-112 is the 15th assembly flight to the International Space Station, carrying the S1 Integrated Truss Structure, the first starboard truss segment, to b…