Example of a flux rope ejection from period A. From top to bottom, the rows show days 122, 124, 126, and 128. The left column shows the (absolute) running daily difference of horizontal field at the outer boundary r = r₁. The middle column shows the distribution of on r = r₀ (saturated at ± 2 Mx), and the right column shows the distribution of Tw at r = r₀ (saturated at ± 40). The dashed lines in the left column show the neutral line where B_r(r₁,θ,φ) = 0. Black circles in the other columns identify footpoints of field lines traced down from locations at r = r₁ where the running difference of B_⊥ exceeds 0.05 G day^-1. Animated versions of this figure for both periods A and B are available online.