t10y2y.csv: 10-Year minus 2-Year Treasury yield spread, daily (FRED series T10Y2Y, Federal Reserve Bank of St. Louis), Jun 1976 – Sep 2026, downloaded 27 Sep 2026 from https://fred.stlouisfed.org/series/T10Y2Y. usrec.csv: NBER-based recession indicator for the United States, monthly (FRED series USREC), Dec 1854 – Aug 2026, downloaded 27 Sep 2026 from https://fred.stlouisfed.org/series/USREC.