Expedition 13 and STS-121 crewmembers say farewell before STS-121 undocking

S121-E-07715 (15 July 2006) --- Cosmonaut Pavel V. Vinogradov (left), Expedition 13 commander representing Russia's Federal Space Agency; European Space Agency (ESA) astronaut Thomas Reiter, flight engineer; and astronaut Jeffrey N. Williams, NASA space station science officer and flight engineer, wave to the departing STS-121 crew (out of frame) prior to the undocking of Space Shuttle Discovery from the International Space Station. Undocking of the two spacecraft occurred at 5:08 a.m. (CDT) on July 15, 2006.