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ETf <br />Th (hot) <br />0.0 <br />1.0 <br />Tc (cold) Ts <br />Well-watered <br />fields/pixels <br />Bare/dry fields/pixels <br />(80 F) (120 F) <br /> (Ts – Tc ) <br />ETf = 1 - --------------- <br /> dT <br />Simple, but not easy: Establishing Tc and Th is the challenge!