Small set of field lines for our two models of three-dimensional, X-shape + spiral magnetic fields in galactic disks, as seen from an oblique angle: a) model Bd (poloidal component described by Eq. (87)) with r₁ = 3 kpc and n = 2; and b) model Dd (Eq. (31)) with | z₁ |  = 1.5 kpc and . The pitch angle is given by Eq. (65) with p₀ =  −10°, p_∞ =  −90° and H_p = 3 kpc. The selected field lines lie on a given surface of constant ϕ₁ or ϕ₁ + π, and they are separated by a fixed magnetic flux per unit ϕ₁; thus, in model Bd, their vertical spacing at r₁ is determined by Eq. (91) with H = 1.5 kpc, and in model Dd, their radial spacing at z₁ is determined by Eq. (35) with L = 10 kpc. Each box is a (30  kpc)³ cube centered on the galactic center. The trace of the galactic plane is indicated by the solid red circle, and the z-axis by the vertical, dot-dashed black line.