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The frequency of the primary beam 238U82+ at the injection:
Ucool = -360 V
Frev = 1.974647 MHz without bump
Frev=1.97387 MHz with bump
---
ID:
246 MHz + kHz (+/- intensity) ID
521 +++ 238/92+
565 +.    230/89+
595 +++ 235/91+
642 +.    227/88+
670 +.    232/90+ 
693 +++ 237/92+ (strongest line)
721 +.      224/87+
744 ++.   229/89+ (our Th line)
767 ++.   234/91+
822 +.     226/88+
845 +.     231/90+
867 +.     236/92+
901 -       223/87+
922 +.     228/89+
942 +.     233/91+
1001 +.    225/88+    
1020 ++.  230/90+
1039 +.    235/92+ 
1100 +.     227/89+
1211 + <- far off