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Computation of the Gamma function defined
in section 5 page 165-166 in [EV00]. In this
case the list of exceptional divisors are not specified by indices to
the `IND` entry of the chart, but they are given by equations;
therefore an arbitrary pair need not have a common point.

**Input:**-
**a**- the list of weights of the exceptional divisors,
**E**- the list of defining equations of the exceptional divisors,
**S**- the list of variables of the chart
**DEP**- the list of algebraic dependencies of
*S*.

**Output:**- A list of indices to
`E`that are chosen by the Gamma function.