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I wasn't real satisfied with the way 2 blogs had represented the data:

http://bzintelguru.com/blog/tableau-to-the-rescue-how-to-improve-sunlight-foundations-scatterplot-showing-that-congress-speaks-like-juveniles/
http://blog.revolutionanalytics.com/2012/05/the-grade-level-of-congress-speeches-analyzed-with-r.html

Therefore I gave it a try with SAS/Graph software.

Rather than fitting curves to the data, I used straight regression lines.
I also put more reference lines & labels on the axes, to help show what 
grade level the speeches were in.

And I created several different charts, to show various different aspects
of the data.

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