The dollar rose against a basket of currencies on Tuesday as investors, already persuaded the Federal Reserve will keep policy ultra-loose in the near term, trimmed bets against it.
The dollar index edged up slightly to 79.52. However, it remained not far off Friday's 78.998 - a low that hadn't been seen since Feb. 1.
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A break there could pave the way for a test of this year's trough of 78.918 and then the September 2012 low of 78.601.
Traders said the market lacked conviction and moves were driven more by flows and position adjustments ahead of the Fed policy meeting on Tuesday and Wednesday than by fundamentals.