Subsurface structure of the developing right spot at t = 16 hr. The azimuthally averaged magnetic field is shown in orange ( in logarithmic scale from 10 G to 10 kG). The contour lines show flux surfaces enclosing flux content ranging from Φ = 10²¹ to Φ = 1.2 × 10²² Mx in intervals of ΔΦ = 10²¹ Mx. Overlaid vectors display components of the azimuthally averaged velocity field in the r–z plane. The yellow arrow at the bottom of the plot corresponds to 2 km s⁻¹. The average flow field is roughly aligned with the average magnetic field, which loads the subsurface layers with buoyant, predominantly horizontal magnetic flux ready to emerge.