• AUD/USD has traded a 17 pip range thus far Tuesday; 0.7206-0.7223

• 0.7223 is two pips shy of Monday's four-month high

• AUD supported by hawkish guidance from RBA's Hunter

• Markets currently see two-in-three chance of RBA rate hike on Sept 29

• China August iron ore imports up 0.4% vs expected decline

• Iron ore is Australia's single-biggest export earner

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(Robert Howard is a Reuters market analyst. The views expressed are his own)