Differences in distribution of the magnetic field components relative to the corresponding maps from the simultaneous MDI of Fe, Nd iii and Na. In rows one to four we plot the differences for the radial, meridional, and azimuthal components of the magnetic field and for the field modulus. In Col. 1 we plot the differences for the magnetic field components derived from the MDI inversion of Fe; in Col. 2 we plot the same quantities for Nd iii; in Col. 3 we plot the differences of the magnetic field components derived from the simultaneous MDI of Fe and Nd iii lines. In each plot we mark the 16 and 84 percentiles with white and black lines. The bars on the right indicate the difference of the corresponding components measured in kG.