Method for discriminating {HEAD ~ anomaly} in {TAIL ~ gas composition} and discharge excitation type gas laser oscillator 
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Method for discriminating { HEAD ~ anomaly } in { TAIL ~ gas composition } and discharge excitation type gas laser oscillator
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH