Maps in (r, θ) coordinates showing the following (from the left): absolute value of the cosine of the pitch angle between the velocity three-vector vⁱ and the magnetic-field three-vector Bⁱ; azimuthal component of the velocity three-vector vⁱ; azimuthal component of the velocity three-vector v_⊥ⁱ perpendicular to the local Bⁱ. Upper row of panels: prograde a = 0.9 case for t = 19 594M and ϕ ≃ 90°; lower row of panels: retrograde a = −0.9 case for t = 17 000M and ϕ ≃ 90°.