Blanks are control data obtained in a reference condition. We can then decide to ignore some of the spikes that appear in the blanks, since there may not be related to the chimical process under study.

Select filter to ignore these species:

The criterion for removing a spike is based on the ratio between the blank intensity and the signal intensity. Spikes for which this ratio is above a selected threshold are removed. Then, more spikes will be therefore removed with a small ratio:

Click on Plot blanks to visualize the blanks, i.e to plot the intensities of the blanks or display the ratios between the blank intensities and the signal intensities: