By Ben Eisen
NEW YORK (MarketWatch) -- Treasury demand increased to briefly push yields down to their lowest levels of 2013 early Tuesday morning. Driven by weak economic data out of China and Germany, the 10-year note 10_YEAR -1.53% hit a yield of 1.646% before retreating back to 1.670%, still a fall of nearly 3 basis points on the day. Yields move inversely to prices and 1 basis point is equal to 1/100 of 1%. The 30-year bond 30_YEAR -1.01% yield was down nearly 3 basis points on the day to 2.852% while the 5-year note 5_YEAR -1.59% yield was down 1.5 basis points to 0.679%. The Treasury Department auctions off $35 billion of 2-year Treasury notes 2_YEAR +0.88% Tuesday, followed by $35 billion of 5-year notes Wednesday and $29 billion of 7-year notes 7_YEAR -1.79% Thursday.