- The degree of divergence of the derivative in the scaling region should not exceed 10%;
- The scaling region should extend for at least
*two*decades (cf. figure 7.9...); - The values of the estimated dimension should be stable within 10% for at least four consecutive values of the embedding dimension.

The scaling region is usually identified by looking for a straight
region of the correlation integral or a constant region of its
derivative by the naked eye. A method due to Ellner [Ellner, 1988]
can be useful to reduce distorsions of the correlation integral
due to statistical fluctuations at the small distances region so
that the scaling region identified may become longer.

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