Comparison
To compare two measurements with each other, you must first select a data set for comparison. To do this, click on the button: 
This is located to the right of
.
You can select a comparison measurement in the following preview window:
Figure 8: Select comparative measurement
Select a comparison measurement by clicking on it. Now confirm this selection with the "Select" button.
To see the selected comparison, you must tick the checkbox before the comparison. If you deactivate the checkbox, you will return to the initial measurement.