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Reasonable values for the $\delta $ parameter:

delta float[dimensionless scalar variable]

In renormalization theory based upon a non-interacting polymer, $\delta $ appears to approach a value of $2.5$. For interacting polymers, the matter is not so clear-cut, but one probably should not exceed $2.5$ by much since the exponent has the tendency to "damp out" the correlation. There is little meaning in a correlation of less than exponential square root as might be attributed to a spin-glass system or some forms of neural networks. Therefore, the value for $\delta $ has been set to the limits $0.5 \le \delta \le 3.0$.

Wayne Dawson 2006-10-31