Vertical variation in physical parameters at different positions on the spine of the LB. Columns a–e: 2D slices of the currents J_z and J_hor, Joule heating by Cowling resistivity, LTE temperature T, and NLTE temperature T (left to right) for the horizontal cuts across the LB (panel 2b in Fig. 2). Panel f: vertical distribution of parameters at the center of the LB at the white horizontal cut shown in Fig. 2b. The heating term has been scaled down by a factor of five. Panel g: horizontal variation in parameters along the same cut after temperature, current, and heating were averaged in height. The heating term has been reduced by a factor of two. Panel h: same as above but for J_⊥, η_C, and the Joule heating. J_⊥ has been scaled up by a factor of three.