IRIS spectrograph images of the recurrent jet. The Si IV intensity maps (top panel; reverse colour), Doppler velocity maps (middle panel) and nonthermal velocity maps (bottom panel) for four rasters. The times indicate the start time for each raster. The oveplotted green and yellow boxes show the spire and footpoint regions respectively. These regions were used for the calculation of Doppler (shown by black arrows) and nonthermal (shown by white arrows) velocities.