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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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percent accuracy

In the experimental measurement of an exact mass, the percent accuracy is calculated as the (true mass - observed mass)/true mass x 100%. The percent accuracy is often expressed in parts per million (ppm). For example, 0.01% accuracy is 100 ppm. A 100 ppm accuracy for an ion with a mass of 1000 Da is 0.1 Da.


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