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The Treasury sold 8 billion euros bills maturing on Oct. 14 2013 paying a yield of 1.94 percent, the highest since August.
It had paid 1.69 percent on a similar maturity at a mid-September sale when the European Central Bank's commitment to intervene in the bond market boosted investors' demand for Italian short-term paper.
On Wednesday the Treasury issued also 3 billion euros of three-month bill with a yield of 0.765 percent, slightly up from 0.7 percent at mid-September auction.