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The yuan rose as traders said the central bank was spotted reducing its intervention in the market after having engineered a sudden depreciation of the yuan since last month.
South Korea's won gained as investors added bullish bets following its gains in overnight non-deliverable markets.
Local importers, however, bought dollars for payments, limiting the won's appreciation, traders said.
The Thai baht gained as Bangkok shares hit a near three-month high, while some investors took profits on the second best-performing emerging Asian currency of the year.
The Taiwan dollar advanced on inflows from foreign financial institutions for the island's stocks.