obsolete MS1 TIC quartile ratios true MS MS1-TIC-Q2 MS:4000058 MS1-TIC-Q3 MS:4000187 MS1-TIC-Q4 The metric informs about the dynamic range of the acquisition along the chromatographic separation. The ratios provide information on the distribution of the TIC values for one LC-MS run. Within an experiment, with the same LC setup, values should be comparable between samples. OBSOLETE. The log ratios of successive TIC quartiles. The metric's value triplet represents the log ratios of TIC-Q2 to TIC-Q1, TIC-Q3 to TIC-Q2, TIC-max to TIC-Q3.