US stock futures extend gains slightly after economic data

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S&P DEP RECEIPTS (NYSE: SPY) Delayed: 744.16 +2.47 (0.33%)
Previous Close $741.69    52 Week High $219.60 
Open $744.68    52 Week Low $181.02 
Day High $746.30    P/E N/A 
Day Low $744.10    EPS $0.00 
Volume 3,520,724