has_metric_category has_units has_value_concept has value type n-tuple ID free metric single run based metric retention time metric chromatogram metric TIC quantile RT fraction RT-TIC-Q2 The metric informs about the dynamic range of the acquisition along the chromatographic separation. The metric provides information on the sample (compound) flow along the chromatographic run, potentially revealing poor chromatographic performance, such as the absence of a signal for a significant portion of the run. RT-TIC-Q1 RT-TIC-Q4 RT-TIC-Q3 MS:4000183 MS The interval when the respective quantile of the TIC accumulates divided by retention time duration. The number of values in the tuple implies the quantile mode. fraction