Differences between the models derived from the GD1 solution and the GD2 solution. The left panels show the differences for Obs16, and the right panels show the differences for Obs17. The horizontal direction corresponds to the x-axis, and the vertical direction corresponds to the y-axis. The vectors of the solutions are magnified by factors of 200 for Obs16 and 100 for Obs17, respectively. Maximums, medians, and the RMSs of the differences are shown at the top in pixels. We note that RMS =