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Performing blowing up operation on a chart-record along a given center. The center is defined either by giving indices to IND or by giving the defining equations of normal crossing hypersurfaces. The procedure creates new chart-records whose charts cover the blown up variety and the basic objects are transformed properly along the stack. The new charts are embedded into the affine ambient space of the input chart (i.e. the number of k-algebra generators remain the same).
This variant of blowup is used when skewcover is true.