http://www.reuters.com/article/economicNews/idUSN1522979820070215 NEW YORK, Feb 15 (Reuters) - Factory activity in the U.S. Mid-Atlantic region barely grew in February, giving back most of January's rebound from a dip at the end of last year, according to a survey released on Thursday. The Philadelphia Federal Reserve Bank said its business activity index slumped unexpectedly to 0.6 in February from 8.3 in January. Wall Street analysts on average had forecast a dip to 5.0, but the result was under even the lowest of projections. In January, the index rose to its highest since August 2006. A reading above zero indicates growth in the region's manufacturing sector. The new orders index, a gauge of future growth, fell to minus 0.5 in February after 1.3 in January. The survey, covering eastern Pennsylvania, southern New Jersey and Delaware, is seen as an early indicator of the health of the U.S. manufacturing sector. It follows reports showing an unexpected fall in January U.S. industrial output but surprisingly strong New York State factory activity in February.