iPath S&P 500 VIX ST Futures ETN (VXX) trading higher in after hours

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IPATH S&P 500 VIX SHORT-TERM FUTURES ETN DUE 1/30/2019 (NYSE: VXX) Delayed: 22.62 -0.18 (0.79%)
Previous Close $22.80    52 Week High $40.93 
Open $22.26    52 Week Low $9.30 
Day High $22.75    P/E N/A 
Day Low $21.92    EPS $0.00 
Volume 15,358,344