Here is a screen shot of a 3-way binary comparison view:
This screen-shot
shows the 3-way Binary Comparison view with ancestor displayed.
This view shows in details what changes between the left/right
sources with respect to the ancestor file. This screenshot
includes a folded block visible in the second and third lines
in the ancestor and right views, and a bookmark set in the left
view. In this sample, offset are hidden, but the current cursor
positiion is displayed in the status bar.