Left: Polar Laplacian-filtered image of 3I from the August 19 observations (the inset shows the corresponding sky-plane filtered image). From the polar-filtered frames, PA profiles were extracted at several radial distances within ±250 km (dotted red lines) around 6000 km from the optocenter (solid red line). At each radius, the PA of the jet was measured by fitting a parabola to the local intensity minimum in the jet region. Right: Linear regression of the measured PAs as a function of radius yields the final PA jet value (yellow line) with errors (dotted yellow lines) at r = 6000 km.