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Regional currencies initially rose on the dollar's overnight weakness but pared their gains as the greenback rebounded against a basket of major currencies.
The South Korean won ended up 0.1 percent on exporters' demand for settlements.
The yuan hit a near-six-month high as China's central bank set a firmer midpoint and on some hopes of positive August trade data.
Thailand's baht edged higher as consumer confidence rose for the fourth consecutive month to a 13-month high.
The European Central Bank is under strong pressure to tackle stubbornly low inflation at a time when the conflict in Ukraine threatens to destabilise the euro zone's fragile recovery.