Abstract for JLAB Technical Note 01-055

A method for placing complicated variable cuts on data is presented. It is used to find an optimal cut on HRS acceptance, which selects maximum region of "flat" acceptance. The method is based on utilizing R-function formalism, that allows to use equations of boundaries of a geometrical object to construct functions that are equal to 0 on the boundary of the object, have different signs inside and outside the object and in absolute value approximate distance functions to the boundary of the object.

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