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TORONTO, Feb 23 (Reuters) - Toronto's main stock index turned negative at mid morning on Monday, undoing a more than 1 percent gain at the open, as a slide in gold prices rattled the materials sector and offset gains in the heavyweight financial group.
At 10:35 a.m. (1535 GMT), the S&P/TSX composite index .GSPTSE was down 2.73 points at 7,947.26. Earlier, it had rallied as much as 1.03 percent. (Reporting by Frank Pingue; Editing by Peter Galloway)