After the extraction is done, the data is subjected to a quality assessment stage. The quality of each MS1 parent data point is assessed based on the existence of MS1 and MS2 data, the noise level and the retention time shift compared with the provided thresholds. This step is also used to select a representative MS2 spectra (if present) for the input masses. These checks are all automated based on the input parameters, but can be reviewed manually once processing is done. The GUI will inform the user when the extraction is done and summarise the main parameters (Figure , left). After prescreening, it is possible to navigate the spectra via the Compound Index (Figure , right), using fully searchable tables. It is also possible to filter based on quantities of interest such as m/z, retention time, or quality score. A detailed overview of the experimental properties and quality for a particular measurement is available in the Measurement Properties pane (Figure ).