Comparison of expansion height maps for the classical PFSS implementation using spherical harmonic coefficients with order 9 in the left column, with order 20 in the middle column, and our grid solver in the right column. Again Carrington rotation 2066 is depicted. All models employ a spherical source surface at 2.5R⊙ heliocentric distance. The height levels in rows 1 to 4 are spheres at heliocentric distances of 1.0R⊙, 1.5R⊙, 2.0R⊙, and 2.5R⊙.
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