Abstract. This is the second of series of papers discussing the problem stated by spatial dependence of stellar magnitudes. In this paper we offer a method to reduce stellar magnitudes of this systematic error. It relays on involving new terms in the equation reducing instrumental magnitudes into standard photometric system. Following the results of our previous investigation these terms are presented as a quadratic function of the stellar image centroid. It is found that spatial reduction of instrumental magnitudes changes the net value of the photometric zero-point and decreases the scatter in magnitudes.

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