Go to the web site of the Federal Reserve Bank of St. Louis (FRED) (fred.stlouisfed.org) and download and graph the data series for the 3-month Treasury bill (TB3MS), the 10-year Treasury note (GS10), and the 30-year Treasury bond (GS30) for the period from January 1990 to the most recent month. (Notice that there is a period when  the Treasury stopped selling 30-year bonds, so no data are available for these months.) During which periods is the gap between the 10-year note and the 30-year bond the greatest? During which periods is the gap between the 10-year note and the 3-month bill the greatest?