n mass  radius    x   y   z   vx   vy   vz fix_x fix_y fix_z
1 27000    1.0    0   0   0    0    0    0     1     1     1
2    81    0.2   10   0   0    0    0  520     0     0     0
3     1    0.1   10.5 0   0    0    0  647     0     0     0