Projections of knot trajectories onto perpendicular planes. Arrows give trajectories of particular knots together with projected velocity vector. Axes are oriented as follows: x axis oriented right in the POS along bottom edge of the slit-jaw image, y axis oriented up along left edge of the slit-jaw image, z axis oriented along LOS away from the observer. Bottom right panel shows an overplot of the vectors onto a prominence image from 10:49:44 UT (Movie 4 shows an animation of this). Thread numbers correspond to numbers in Table 1. In the ıtop left corner of each panel, reference velocity vector in the plot scale is drawn. Small rectangle in top left panel shows the area of bottom right panel, which has a different scale than the other panels.