Helical magnetic field, (𝒜ℬ𝒞) model, with 𝒜 = ℬ = 𝒞 = 1 and λ = +2. The total helicity integrated over the cube is H = 49 in normalized units. The box has a uniform density field. Panel a: 3D rendering of the magnetic-field lines in green; panel b: projected map of Stokes Q with LOS integration along the y-axis; panel c: projected map of Stokes U; panel d: projected map of Stokes I with overlaid magnetic-field lines tracing the orientation of b on the plane of the sky; panel e: helicity-column map ℋ.
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