{HEAD ~ This invention} relates to a method and {TAIL ~ an apparatus} of mass spectrometry, and in particular to a method and an apparatus for storage and injection of ions into an electrostatic ion trap 
relates to
{ HEAD ~ This invention } relates to a method and { TAIL ~ an apparatus } of mass spectrometry , and in particular to a method and an apparatus for storage and injection of ions into an electrostatic ion trap
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