(REUTERS) -- Stock index futures pared gains on Tuesday after data showed orders for long-lasting manufactured goods fell more than expected in January.

S&P 500 futures rose 1.9 points and were above fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration of the contract. Dow Jones industrial average futures added 21 points and Nasdaq 100 futures gained 6.75 points.