figures

![plot 1](https://cloud.githubusercontent.com/assets/4474536/3009021/34f7af3a-dedf-11e3-94c8-d0e6983e3b44.png)
![plot 2](https://cloud.githubusercontent.com/assets/4474536/3009023/39380658-dedf-11e3-860e-df446fd9f121.png)
![plot 3](https://cloud.githubusercontent.com/assets/4474536/3009024/3c0ebd40-dedf-11e3-9024-4b1d95865048.png)
![plot 4](https://cloud.githubusercontent.com/assets/4474536/3009026/3ef5fc1c-dedf-11e3-86a1-a7a6ebb6d646.png)