tokens: Synergistic effects between radiobiological damage and other environmental stressors and the radiation protection limits specified in 11.4a shall be analysed . NOTE 1 Example of such environmental stressors are microgravity , vibration , acceleration , and hypoxia NOTE 2 For guidelines on the influence of spaceflight environment , see ECSS - E - HB-10 - 12 Section 10.5.7 .