The total rise over that period was about 0.6 °C. They then held steady until around 5500 years ago, when they began slowly falling again until around 1850. The drop was 0.7 °C, roughly ...

The gradient of a distance-time graph is equal to the speed, and the gradient of a force-extension graph is equal to the spring constant. The area under a graph can also be calculated.

From a straight-line graph the gradient can be calculated. The gradient of a distance-time graph is equal to the speed, and the gradient of a force-extension graph is equal to the spring constant.