Spectral index distribution (α) of the radio structure obtained for the run 3Dmaj_ref is shown. Here, wings show steep spectral index compared to the active lobes due to the accumulation of older particles. However, the presence of several flatter α patches are also noticeable (especially in the wings), which are generated due to re-energised particles at shock sites. The frequencies used here to produce this map are 240 MHz and 5 GHz.