Stocks pared their losses heading into the final hour of trading. The Dow Jones industrial average — bolstered by 9% and 3% jumps respectively in DuPont (DD) and Chevron (CVX) — held an 0.3% gain. The S&P 500 shed 0.2% while the Nasdaq, down as much as 1.5% earlier, gave up 0.6%. Volume was tracking higher on both exchanges vs. the same time Monday.