Slide 27&#x2F;36, aka. slide 18&#x2F;23, shows a type of graph which I have also seen in the Google Chrome Dev Tools as well as a couple of other places. Someone told me once the name of that kind graph but I&#x27;ve forgotten what it was. I&#x27;ve never learned how to read that kind of graph. So, if someone would be so kind, please tell me what it&#x27;s called and how to read it.