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Computing the generators of the singular locus of the monomial part with respect to a given threshold.

**Input:**-
**E, a, IND**- the corresponding members of a basic object and its chart (see section *, and *).
**r**- a rational value
*0 <= r < 1*.

**Output:**- a list of polynomials generating the the points of the
zero set of the monomial part, represented by
`E`and`a`, which are at least of order*1-r*.