Figure 2 in [this tutorial](http://uk.mathworks.com/help/simulink/examples/modeling-an-automatic-transmission-controller.html) represents the shift map/schedule of an automatic transmission. How is this map constructed? I want to know how to design a shift map myself for another transmission.

The shift map is below:

[![enter image description here](https://i.stack.imgur.com/vFfNqm.png)](https://i.stack.imgur.com/vFfNqm.png)