Fig. 3
From: QCScreen: a software tool for data quality control in LC-HRMS based metabolomics
Graphical illustration of feature area, retention time and mass accuracy for jasmonic acid. The illustration of the monitored parameter values of feature area indicates a separation (offset) of the two measurement sequences due to an alteration of instrument sensitivity, a. b shows a stable chromatographic process and c clearly illustrates a stable m/z offset in S1 and an m/z drift in S2, which can also be seen in the other compounds of the tested standard QC sample (Additional file 1)