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Figure 1


Fig. 1. Scheme of the simulation model. The model's response to the targets is the product of three factors relating the size, speed and elevation of the experimental target to those of an ideal target. For size and speed, the response is unity if the target is ideal, and falls off from unity with increasing deviation from the ideal, following a normal curve with standard deviation {sigma}. The normal curve is symmetrical around the ideal if the constant {kappa}=1, otherwise the response is asymmetrical about the ideal. For elevation, the response factor is 1-R, where R is an elevation dependent variable between 0 and 1. These `prey generalization parameters' {sigma}, {kappa} and R are determined by a least-squared means optimization. See text for further details.





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