Why did the author add that "shadow" graph?
What's going on in this graph? (i.e. what would be an accurate conclusion that can be supported by this graph)
To answer this question use the CER framework
What is being shown in the y-axis?
Look at the "shadow" graph, what does it represent?
Write a >140 character Tweet that could accompany the sharing of the of the map/image.
This means, you would write a short sentence or two that describes one surprising thing you noticed from the map and you accompany it with one or two relevant hashtags.