Diffraction vector type: h,0,l
For h = 1, l = 1: I /= 0 F = (0,Fy,0)
For h = 1, l = 4: I /= 0 F = (2*Fy,Fy,Fz)
For h = 2, l = 2: I /= 0 F = (2*Fy,Fy,Fz)
For h = 2, l = 5: I /= 0 F = (0,Fy,0)
For h = 3, l = 3: I /= 0 F = (0,Fy,0)
For h = 3, l = 6: I /= 0 F = (2*Fy,Fy,Fz)
Diffraction vector type: 0,k,l
For k = 1, l = 2: I /= 0 F = (Fx,2*Fx,Fz)
For k = 1, l = 5: I /= 0 F = (Fx,0,0)
For k = 2, l = 1: I /= 0 F = (Fx,0,0)
For k = 2, l = 4: I /= 0 F = (Fx,2*Fx,Fz)
For k = 3, l = 3: I /= 0 F = (Fx,0,0)
For k = 3, l = 6: I /= 0 F = (Fx,2*Fx,Fz)