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The T-bills were priced to yield 3.01 percent, down from 3.60 percent in a March auction.
The sale's bid-cover ratio was 3.10, up from 2.31 in the previous sale.
The amount raised included 300 million euros in non-competitive bids.
The settlement date for Tuesday's auction will be April 11.
Monthly T-bill sales are Greece's sole remaining source of market funding.
Athens has a stock of about 15 billion euros of T-bills, which it regularly refinances with the help of Greek banks which buy and then deposit them as collateral to draw liquidity from the ECB.