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The establishment of EVISA is funded by the EU through the Fifth Framework Programme (G7RT- CT- 2002- 05112).

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base peak

The base peak in a mass spectrum (within the user-selected mass range) is the ion with the highest measured abundance. The relative abundance of the base  peak ion is assigned a value of 100, and the abundances of all the other ions plotted in that mass spectrum are normalized  to that value. The y-axis in a mass spectrum is therefore given in terms of relative abundance.


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