GD solution for 90Prime camera of the Bok 2.3-m telescope. The left panels show GD1 solutions derived by photographic astrometry, and the right panels show GD2 solutions derived by differential astrometry. The top panels show GD solutions derived from Obs16, and the bottom panels show those derived from 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 a factor of 20. Maximums and medians are shown at the top in pixels.