focus + scope: click on a word to select the focus and then adjust the scope. Currently, only the temporal scope is implemented so it behaves more like zooming. When I get some time, I will implement zooming and the other metrics...
data was collected with a web based app which is meant to be run with an eye-tracker that controls the mouse. If you visit this page without an eye tracker, to simulate reading by phyiscally moving the mouse over the words you read--you will have to hit shift-d so that you can see the pointer which would otherwise be distracting.