Both the kind and amount of the cross linking substance added and the energy input of the subsequent irradiation then control the hardness of {HEAD ~ the material} of {TAIL ~ the second region} 
of
Both the kind and amount of the cross linking substance added and the energy input of the subsequent irradiation then control the hardness of { HEAD ~ the material } of { TAIL ~ the second region }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL