
  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: line parameter report
       Pressing down button 3 starts a line-segment operation for reporting
       slope and intercepts.  Holding down, moving, then releasing define 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: curve label operation
       Pressing down button 3 with shift held down starts a curve-label
       operation.  Holding down, moving, then releasing defines a
       line-segment.  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 3 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: 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.
