Observed (dotted red curves) and calculated (solid black curves) proton differential intensities for 10 out of 25 energy channels simulated for the 2006 December 13 SEP event. The calculated profiles are obtained by using the Q(VR) fits displayed in the right panel of Figure 7 and listed in Appendix B. The top left panel also shows the modelled (black trace) and observed (red dotted trace) first order anisotropy component parallel to the magnetic field, A1/A0. Arrows mark the starting time of the X-ray flare and vertical lines the time of the shock crossing by the ACE spacecraft.