Natural-gas prices fall further after supply data                                 (                                     NGV13                                 )                                by Myra P. Saefong

SAN FRANCISCO (MarketWatch) -- Natural-gas futures fell further on Thursday after the U.S. Energy Information Administration reported a supply climb of 87 billion cubic feet for the week ended Sept. 20. That was more than what the market expected. Analysts polled by Platts forecast a climb of between 74 billion cubic feet and 78 billion cubic feet. Total stocks now stand at 3.386 trillion cubic feet, down 179 billion cubic feet from the year-ago level and 30 billion cubic feet above the five-year average, the government said. October natural gas     (ngv13)   was at $3.42 per million British thermal units, down 7 cents, or 2.1%. It was trading lower at $3.45 before the data.