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Metallicities may have an important effect on their properties.\n  Aims: In this paper, we study the He star donor channel towards SNe Ia comprehensively and systematically at various metallicities.\n  Methods: Employing Eggleton's stellar evolution code with the optically thick wind assumption, we calculated about 10 000 WD + He star systems and obtained SN Ia production regions of the He star donor channel with metallicities Z=0.03, 0.02, 0.004 and 0.0001. 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