* Spain to auction bonds due 2015, 2016, 2022 * Auction results due around 0840 GMT * Yields seen lower on all three maturities By Paul Day MADRID, Oct 18 (Reuters) - Spain's funding costs are set to fall at auction on Thursday after Moody's affirmed the country's investment-grade credit rating and as markets expect Madrid to ask for aid soon. The Treasury plans to raise 3.5 billion to 4.5 billion euros ($4.6 billion-$5.9 billion) in an auction of three bonds maturing in 2015, 2016 and 2022. Results of the auction will be published at around 0840 GMT. The auction comes on the heels of a successful T-bill sale on Tuesday, when...
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