MADRID, 13 marzo (Reuters) - MADRID, March 13 (Reuters) - Spain announced the following results at Tuesday's Treasury bill auction . (Amounts bid, allocated in millions of euros) ISSUE YIELD PREVIOUS PRICE PREVIOUS BID ALLOCATED 3-month -0.543 -0.507 100.138 100.109 2,377 425 9-month -0.464 -0.444 100.344 100.330 3,630 930 The bid-to-cover ratio on the 3-month bill was 5.6 versus 6.2 at the last auction. The bid-to-cover ratio on the 9-month bill was 3.9 versus 4.7 at the last auction. For further information, click on and . (Reporting by Madrid Newsroom)