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The paper was sold at a yield of 2.50 percent, down 28 basis points from a previous sale last month. The amount raised included 187.5 million euros in non-competitive bids.
The sale's bid-to-cover ratio was 1.86, up from 1.30 in the previous auction in July.
In a rollover T-bill holders renew their positions instead of getting paid on the maturing paper they hold. The settlement date of the new bills is August 4.