STS-115 MS Tanner and Stefanyshyn-Piper work on the S1 Truss during third EVA

View of Astronaut Joseph R. (Joe) Tanner, STS-115 Mission Specialist (MS), in the red striped Extravehicular Mobility Unit (EMU), as he uses the Infrared (IR) CAM from the Forward (FWD) side of the S1 Truss to take image of the Starboard (STBD) Wing Leading Edge (WLE) of Atlantis for Detailed Test Objective (DTO) 851 while Astronaut Heidemarie M. Stefanyshyn-Piper, STS-115 MS, in the white striped EMU, removes stowed equipment during third Extravehicular Activity (EVA).