Stratification of log(β) (top panels) and log(B_eq/B) (bottom panels) along the cuts displayed in Fig. 6. The red (top) and blue (bottom) lines mark the τ = 1 surface. The black lines mark the zero value of log(β) and log(B_eq/B). The short vertical lines crossing the upper edges of the panels mark the positions where the cuts cross the contours displayed in Fig. 6. Only the upper part of the simulation domain is displayed in the case of log(β).