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Model comparison (combining with a LOG compressor). Np: the number of parameters; ν: degrees of freedom; DS model: Equation 20 (Model 3); DSKL model: Equation 23 (Model 5); Two-stage model: Equation 31; Two-stage + Max model (GWMB model): Equations 31-33; Legge Model (power summation model): Equation 29; contrast normalization model: Equation 30.
