 interact with segmentation labels. It is shown below.</p>
 <p align="center"><img src="Artwork/ttManualSegmentLabelSubPanel.gif" width="144" height="207"></p>
 <p>At the top of this sub-panel are two drop-down boxes. The first box is used to select the label that is currently used for manual and automatic segmentation. The second box is used to select the label or labels that are affected by the segmentation. We will see how to use these drop boxes a few steps below. Below the drop-boxes is located a butto