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functions,var: (left-click): change to SAGITTAL view
  raise_window
  set plane 2
  pixvaltitle 0 0 0
  redraw
  unzoomcoords
-------------------------------------------

If the view is not SAGITTAL, a default left-click
of the SAGITTAL button changes to the sagittal
slice that goes through the current cursor in
CORONAL or HORIZONTAL view.
