LISBONA, 13 agosto (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 6-month -0.534 -0.496 100.271 100.261 2,695 795 12-month -0.505 -0.465 100.514 100.473 7,097 The bid-to-cover ratio on the 6-month bill was 3.4 versus 2.8 at the last auction. The bid-to-cover ratio on the 12-month bill was 1.9 versus 1.7 at the last auction. For further information, click on TESORESP08 and BANCS. (Reporting by Gdynia Newsroom) (( gdynia.newsroom@thomsonreuters.com ; +48 58 772 0920) )