The Earnings Reaction Graph is an exclusive feature for Diamond members (to learn about Slope memberships, click here).
What the page does is presents to you all the historical reactions from company earnings announcements. All you have to do is enter a ticker symbol and click Go (or press the Return key).
You now can see the immediate reaction a given stock had during all of its prior earnings periods from longest ago (left side) to most recent (right side). The black line is the average of all of them, and you can turn this black line on and off with a checkbox.
You can point to any one of these bars to see the date of the event and the percentage-based price reaction.