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Ten-year Spanish yields were last 11 basis points higher at 6.52 percent, taking the spread over benchmark German Bunds to 508 basis points. Italian 10-year yields also rose slightly to 5.83 percent.
Spanish five-year yields were 18 bps higher at 5.68 percent.
Both Spanish and Italian yields have risen this week as euphoria over last week's summit agreement to re-model the euro zone's rescue funds has faded with markets keen for details of how the accord will be implemented.