has_column has_metric_category external reference identifier table ID based metric single run based metric chromatogram metric targeted compound name targeted compound intensity targeted compound intensities The intensity of the chromatographic peak of each compound of a set of targeted/expected compounds (e.g., from a QC mix). The compounds are identified by the 'targeted compound name' and 'external reference identifier' columns, and the corresponding intensities are given in the 'targeted compound intensity' column. Compounds missing from the table are interpreted as not detected. The compounds need to be confidently identified, ideally by several characteristics (e.g., mass spectrum and retention time). MS:4000246 MS In contrast to the aggregated MS:4000244 (the mean of the peak intensities), this metric retains the per-compound values, which makes it possible to distinguish a global loss of sensitivity from a loss affecting only compounds of a certain volatility, polarity or concentration.