Additional Licenses
- Figure 6: Tessier© CC-BY-SA 3.0 Unported
- Figure 7: Djtox© The copyright holder of this file allows anyone to use it for any purpose, provided that the copyright holder is properly attributed. Redistribution, derivative work, commercial use, and all other use is permitted.
- Figure 8: Maurice Marcellin© CC-BY-SA 3.0 Unported
- Figure 9: BobTheMad© CC-BY-SA 3.0 Unported
- Figure 10: Andreas Praefcke© CC-BY-SA 3.0 Unported
- Figure 11: Softeis© CC-BY-SA 3.0 Unported
- Figure 12: Rafaelji© CC-BY-SA 3.0 Unported
- Figure 13: tato grasso© CC-BY-SA 2.5
- Figure 14: Pabix© CC-BY-SA 3.0 Unported