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A unit of length used in printing. An em is one-sixth of an inch. It is also called a pica.
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References in periodicals archive ?
The ions subsequently, are destabilized and ejected with 50% efficiency to the electron multiplier by a rapid ramping of the RF voltage applied to the central ring electrode.
The GC-MS was run with the electron multiplier set at 1600 eV and an injection volume of 1.5 [micro]L.

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