The output of the apparatus is useful for controlling {TAIL ~ process parameters} which affect {HEAD ~ image quality} 
The output of the apparatus is useful for controlling { TAIL ~ process parameters } which affect { HEAD ~ image quality }
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD