{HEAD ~ a first sub path} configured to extract {TAIL ~ the second order intermodulation component} from the path tuning signal of the main path 
configured to extract
{ HEAD ~ a first sub path } configured to extract { TAIL ~ the second order intermodulation component } from the path tuning signal of the main path
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH