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A part of an uncovered altar shows a frieze of an agricultural deity at the Aztec empire's main Templo Mayor temple, near the central Zocalo square in Mexico City October 4, 2006. Mexican archeologists have made the most significant Aztec find in decades, unearthing a 15th century altar and a huge stone slab at a ruined temple in the throbbing heart of Mexico City. REUTERS/Tomas Bravo (MEXICO)