has_metric_category has_units m/z single value ID based metric ion source metric MS2 metric MS2 precursor median m/z of identified quantification data points MS Median m/z value for MS2 precursors of all quantification data points after user-defined acceptance criteria are applied. These data points may be for example XIC profiles, isotopic pattern areas, or reporter ions (see MS:1001805). The used type should be noted in the metadata or analysis methods section of the recording file for the respective run. In case of multiple acceptance criteria (FDR) available in proteomics, PSM-level FDR should be used for better comparability. MS:4000152 The m/z distribution informs about the dynamic range of the acquisition.