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Schematic diagram of the experimental methods to determine chilling function. (A) Fitting the exponential function between the forcing requirement of budburst and chilling hours (Eqn. 1) under different chilling temperatures (T). (B) Plotting the parameter c0 in the exponential function with respect to T. (C) Normalizing c0 to c and fitting an empirical function (e.g. a piece-wise linear function).
