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The benchmark Shanghai Composite Index slipped 0.26 percent, or 6.16 points, to 2,325.79.
The Shenzhen Composite Index, which tracks stocks on China's second exchange, edged down 0.05 percent, or 0.66 points, to 1,294.13.
China's industrial production growth slowed sharply in August to its lowest level for more than five years at 6.9 percent, official data showed Saturday.