Upper 4 panels: observed (dashed) and fitted synthetic (solid) Stokes profiles from the pixel marked with “+” in Fig. 14. This pixel is adjacent to a spine and associated with a strong redshift (4 km s^-1 at τ_c = 0.95). Note the abnormal Stokes V profile with 3 lobes. The synthetic fitted profile shows the correct shape, but does not reproduce all details of the observed profile. The 630.15/630.25 nm line profiles (plotted side by side) are normalized to the average continuum intensity outside the spot. Lower 4 panels: variations with continuum optical depth of the temperature, LOS velocity, and vertical and horizontal magnetic field (in the solar frame) returned by NICOLE.