{HEAD ~ The method} 13 wherein determining {TAIL ~ a respective second intensity variation step} comprises the substeps of: 
wherein determining
{ HEAD ~ The method } 13 wherein determining { TAIL ~ a respective second intensity variation step } comprises the substeps of :
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH