This section lets you choose the source of your image and therefore the source of the ROI. By default, the active graphics window is chosen into which an ROI can be drawn using the ROI menu of the line profile window. The ID of another graphics window can be selected from the drop-down menu. If a 测量助手 is activated, one assistant can be chosen from the drop down menu or it can be opened by activating the Use Measure Assistant as Data Source button.
The remaining buttons let you choose the visualization of the marker lines the line profile displays within in your active ROI. You can select the color and length of your lines as well as their width. Changing those output features can be necessary to achieve optimum visibility within an image.