
  dataview help
  
  Mouse Bindings:

  MOUSE on plot:
   % button 1: zoom-in
       Pressing down button 1 starts a zoom-in operation.  Holding button 1 
       down and moving to new location displays a zoom-in box with endpoints
       at original location and current location.  Releasing button 1
       changes axes limits of graph to those of the zoom-in box.
   % button 2: restore
       Pressing down button 2 returns axes limits to the original ones.
   % button 3 (or control-button 1): line parameter report
       Pressing down button 3 (or control button 1) starts a line-segment
       operation for reporting slope and intercepts.  Holding down, moving,
       then releasing defines a line-segment.  After release, a report of
       the line-parameters of the defined line segment: slope, y-intercept,
       x-intercept.  For a single press and release, only x and y are reported.
   % shift-button 3 (or shift-button 2): curve label operation
       Pressing down button 3 (or button 2) with shift held down starts
       a curve-label operation.  Holding down, moving, then releasing defines a
       label box.  After release, prompt for text for the label, and 
       whether or not to add an arrow.
   % shift-button 1: delete curve label operation
       Pressing down button 1 with shift held down starts a delete
       curve-label operation.  Holding down, moving, then releasing
       defines a delete box.  After release, any markers within the
       delete box are removed.
   % control-button 3 (or control-button 2): data removal operation
       Pressing down button 3 with control held down starts a data removal
       operation.  Holding down, moving, then releasing defines a
       delete box (red).  After release, any data points (XCOL, YCOL)
       are deleted from the working data set.

  MOUSE on note-book tab:
   % button 1: select page
       Button 1 selects notebook page connected to the tab.
