Scattering/Diffraction calculator of concentric 3D/2D/1D shell model in a 3D/2D/1D lattice

This Javascript calculates the form factor I(q) or F(q) of concentric shell models - sphere, disc (cross-section of long rods) or rod (thickness of large discs) - and the diffraction pattern when placed in a 1D lamellar, 2D hexagonal or square, 3D cubic lattice. Enter the dimension (1/2/3), number of radii, the values for the radius R(i) and its electron-density c(i) (between R(i) and R(i-1)), the d-spacing and the nummber of diffraction peaks (up to 20) of the lattice. The form factor - I(q), logI(q) or F(q) - and the 1D-diffraction (XRD)-pattern will be plotted (neglecting multiplicities and douplets/triplets of the diffraction peaks). Units are arbitrary but reciprocal in scattering and real space.