1. 1 Copyright © 2010, Elsevier Inc. All rights Reserved Fig 4.1 Chapter 4

2. 2 Copyright © 2010, Elsevier Inc. All rights Reserved Fig 4.2 Chapter 4

3. 3 Copyright © 2010, Elsevier Inc. All rights Reserved Fig 4.3 Chapter 4

4. 4 Copyright © 2010, Elsevier Inc. All rights Reserved Fig 4.4 Chapter 4

5. 5 Copyright © 2010, Elsevier Inc. All rights Reserved Fig 4.5 Chapter 4

6. 6 Copyright © 2010, Elsevier Inc. All rights Reserved Fig 4.6 Chapter 4

7. 7 Copyright © 2010, Elsevier Inc. All rights Reserved Fig 4.7 Chapter 4