Again, the scattering factors for X-rays are used. The atoms are shown schematically as disks.
Later examples show the actual electron density distribution.
Now lets calculate the corresponding diffraction pattern. X-rays are used in this example. The left image shows a one dimensional cut throught the center of reciprocal space parallel to the vector between the two atoms, while The right image shows a 2-dimensional section through reciprocal space. You can see that the intensity still drops off continuously with increasing scattering vector. Perpendicular to the vector between the atoms this decrease is not changed at all compared to the previous example.