G₁ halo contours of the EXP15 in the plane XY at three different times: t = 0, t = 0.68t_H at the time of the maximum amplitude of the disk m = 2 component (see Fig. 15), and t = t_H. The G₁ disk contour of the EXP15 in the plane XY at the time t = 0.68t_H. The two outer halo contour density levels correspond approximately to 40% of the total halo mass at the radius R ≈ 4 and 90% of the total halo mass at the radius R ≈ 11. The halo and the disk of the secondary galaxy G₂ can be obtained by reflecting the respective contour image relative to the Y axis at X = 0, since the two galaxies have the same mass distribution.