a) EUV jet observed with the 171 Å filter of SDO/AIA on 17 September 2010. The shorter solid lines indicate the slit positions at six different heights used for b), which are perpendicular to the longer solid line. The length of the slits is 24′′. b) Time-distance diagram of the 171 Å EUV jet along the slits at the six different heights. The dashed black line shows the oscillation pattern at one height, and the white lines indicate the propagation velocity of the oscillation patterns at different heights.