English: Figure 6-13. Postflight (R+0) percent change from preflight measures in muscle endurance at the knee expressed as total work for Space Shuttle (STS), NASA-Mir (Mir) and ISS (for ISS, n = 2).
The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain.
The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2]