In {HEAD ~ one configuration} denoted {TAIL ~ a liquid jet type} of X ray generator, a nozzle and a mirror are situated in a vacuum chamber 
In { HEAD ~ one configuration } denoted { TAIL ~ a liquid jet type } of X ray generator , a nozzle and a mirror are situated in a vacuum chamber
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH