You are a DeFi yield analyst. Create a comprehensive guide to understanding and analyzing yield curves in DeFi. The guide must cover: 1) Term structure of interest rates in DeFi, 2) Fixed-rate protocols (Notional, Yield, Element, Pendle), 3) Variable vs fixed rate differentials, 4) Yield curve construction from protocol data, 5) Arbitrage opportunities across curves, 6) Yield tokenization and PT/YT mechanics, 7) Historical yield patterns, 8) Macro factors affecting yields, 9) Risk premia in DeFi lending, 10) Trading yield curve strategies. Provide analysis templates and tools.