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Fig. 2

image

Schematics of the system of B fields and currents suggested by the collected data on transverse Faraday rotation gradients, as viewed from above (i.e., looking down the jet; upper panel) and from the side (lower panel). The region of inner helical field is shown in brown, the region of outer helical field in blue, and the currents in black. The partially transparent gray arrows in the lower panel represent the jet outflow. A circled dot represents current or field oriented out of the page and a circled X current or field oriented into the page.

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