* Yields remain high at short-term debt auction * Stocks fall sharply on aid request hesitation * Analysts say ECB boost could fade if aid delayed By Julien Toyer and Paul Day MADRID, Sept 18 (Reuters) - Investors on Tuesday piled pressure on Spain to request international aid and trigger a European Central Bank bond-buying programme seen as inevitable to help the country finance its debt, with the benchmark 10-year bond rising to just over 6 percent. Yields at the latest debt sale fell slightly from last month but remained at 2.835 percent on the 12-month bill and at 3.072 percent on the 18-month paper, offering little hope the country can finance itself at reasonable levels without seeking...
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