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