1. 1 Copyright © 2010, Elsevier Inc. All rights Reserved Fig 6.1 Chapter 6

2. 2 Copyright © 2010, Elsevier Inc. All rights Reserved Fig 6.2 Chapter 6

3. 3 Copyright © 2010, Elsevier Inc. All rights Reserved Fig 6.3 Chapter 6

4. 4 Copyright © 2010, Elsevier Inc. All rights Reserved Fig 6.4 Chapter 6

5. 5 Copyright © 2010, Elsevier Inc. All rights Reserved Fig 6.5 Chapter 6

6. 6 Copyright © 2010, Elsevier Inc. All rights Reserved Fig 6.6 Chapter 6

7. 7 Copyright © 2010, Elsevier Inc. All rights Reserved Fig 6.7 Chapter 6

8. 8 Copyright © 2010, Elsevier Inc. All rights Reserved Fig 6.8 Chapter 6

9. 9 Copyright © 2010, Elsevier Inc. All rights Reserved Fig 6.9 Chapter 6

10. 10 Copyright © 2010, Elsevier Inc. All rights Reserved Fig 6.10 Chapter 6