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Fig. 1


Small set of field lines for each of our four models of poloidal, X-shape magnetic fields in galactic halos, in a vertical plane through the galactic center: a) model A (described by Eq. (12)) with r1 = 3 kpc and a = 1/(10  kpc)2; b) model B (Eq. (17)) with r1 = 3 kpc and n = 2; c) model C (Eq. (26)) with a = 1/(10  kpc)2 (and, as always, z1 = 0); and d) model D (Eq. (31)) with | z1 |  = 1.5 kpc and n = 2. Field lines are separated by a fixed magnetic flux per unit azimuthal angle; thus, in models A and B, their vertical spacing at r1 is determined by Eq. (16) or (21) with H = 1.5 kpc, while in models C and D, their radial spacing at z1 is determined by Eq. (30) or (35) with L = 10 kpc. Each panel is 30  kpc × 30  kpc in size and is centered on the galactic center. The trace of the galactic plane is indicated by the horizontal, solid red line, and the z-axis by the vertical, dot-dashed black line.

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