In IPython:
%run -n flatdiskgravity.py
M=400; planar, distM = fill_mass(M)
g = apply_gravitation(planar)
resolution = default_resolution
g_side = apply_gravitation_loc(-1, planar, z=0, resolution=resolution)
fig, ax = plt.subplots(figsize=(10,4))
draw_acceleration(g, ax, g_side=g_side, prop=True)
fig.savefig("example.png", bbox_inches='tight')
plt.close()
And there it is: