The Wall Street rally picked up steam in afternoon trade, as the main indexes closed with their biggest gains in nearly four years, breaking a dramatic six-day slide that left them in correction territory. Stock benchmarks traded within a wide range, with some analysts saying the price action indicated the market was going through a bottoming process. The Dow Jones Industrial Average DJIA, -1.84% jumped 619.07 points, or 4%, to 16,285.51, with all 30 members of the blue-chip index closing higher and 25 of the 30 components rising 3% or more. The S&P 500 SPX, -1.15% closed 72.90 points, or 3.9%, higher at 1,940.51. The Nasdaq Composite COMP, -0.13% ended the day up 191.05 points, or 4.2%, at 4,697.54.