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Fig. 4B —PowerPoint (Microsoft) screen shots show refinement of contours of pancreas (top), inferior vena cava and aorta (middle), and vertebral body (bottom). Objects were drawn at later stage but are shown for relevance. Dashed lines separate structures to show they have been captured from different screens to show anchor points of all objects (Edit Points can be applied to only one object at same time). Adjusted refined drawing. Techniques used are dragging anchor points to more precise location, adding points by clicking and dragging, and deleting points. Symmetric repositioning of anchor points produces shapes that are closer to symmetric, as is case with aorta and inferior vena cava.