has_metric_category has_units has_value_concept has value type intensity unit n-tuple ID based metric MS2 metric unidentified MS2 precursor intensity distribution MS From the distribution of unidentified MS2 precursor intensities, the quantiles. E.g. a value triplet represents the quartiles Q1, Q2, Q3. The used type of identification 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:4000162 The metric informs about the dynamic range of the acquisition in relation to identifiability.