This closeup shows the final splicing completed on the wiring between space shuttle Atlantis' external tank and the engine cutoff, or ECO, sensor system before the replacement feed-through connector in the ECO sensor system is installed. Cryogenic shielding is installed around the wiring. The feed-through connector passes the wires from the inside of the tank to the outside. Results of a tanking test on Dec. 18 pointed to an open circuit in the feed-through connector wiring, which is located at the base of the tank. The pins in the replacement connector have been precisely soldered to create a connection that allows sensors inside the tank to send signals to the computers onboard Atlantis. The work is being done on Launch Pad 39A. Space shuttle Atlantis is now targeted for launch on Feb. 7. Photo credit: NASA/George Shelton