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Accurate Mass


Molecular and fragment masses are normally displayed in nominal mass (integer) units by default.  To display accurate mass values, select Use Accurate (Monoisotopic) Mass from the Options menu.  A check mark will appear next to the item name when it is selected, and the current mass display will be updated.  Accurate Mass will remain in effect until you turn it off or quit the program.  To turn off the display of accurate masses, select (click on)  the Accurate Mass option again.