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Computation of the Gamma function defined in section 5 page 165-166 in [EV00].

C the weight (or exponent) list of the exceptional divisors in the examined WBO (the a member of the WBO).
A list of indices to E (or equivalently to a) that are chosen by the Gamma function.
The E list of a chart is by no means a global list of exceptional divisors. Although the chronological order is correct, some exceptional divisors, which are outside the chart, do not appear. Thus the indices, and consequently the locally computed stratifying function value is not sufficient to detect patching of centers along the chart covering. When this is needed in `desing/dualgraph`, we reconstruct the global indices for the exceptional divisors in all the charts and replace the local ones with them.
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