DataViewm key bindings
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       *  F: autoscale x and y

       *  [: zoom out

       *  ]: zoom in

       *  s: toggle dot symbols to current curve

       *  S: toggle square symbols to current curve

       *  Left:  fine pan left

       *  Right: fine pan right

       *  Down:  fine pan down

       *  Up:    fine pan up

       *  Shift-Left:  coarse pan left

       *  Shift-Right: coarse pan right

       *  Shift-Down:  coarse pan down

       *  Shift-Up:    coarse pan up
