has_metric_category has_value_concept has value type n-tuple ID free metric single run based metric chromatogram metric MS1 metric obsolete MS1 TIC-change quartile ratios true OBSOLETE. The log ratios of successive TIC-change quartiles. The TIC changes are the list of MS1 total ion current (TIC) value changes from one to the next scan, produced when each MS1 TIC is subtracted from the preceding MS1 TIC. The metric's value triplet represents the log ratio of the TIC-change Q2 to Q1, Q3 to Q2, TIC-change-max to Q3 MS:4000057 The metric informs about the dynamic range of the acquisition along the chromatographic separation.This metric evaluates the stability (similarity) of MS1 TIC values from scan to scan along the LC run. High log ratios representing very large intensity differences between pairs of scans might be due to electrospray instability or presence of a chemical contaminant. MS1-TIC-Change-Q2 MS MS1-TIC-Change-Q4 MS1-TIC-Change-Q3 MS:4000186