Copy the monthly yields for corporate bonds with Moodys seasoned ratings of Aaa and Baa, and Treasury constant maturities 10-year bonds from January 2006 through December 2015. This should yield three series of data; one for 10-year Treasury bonds, one for Aaa corporate bonds, and one for Baa corporate bonds.

Plot all three series on the same graph using the 2006- 2015 data. Describe the graphs and explain any differences or similarities.

http://www.federalreserve.gov/releases/H15/data.htm