Zoom Buttons and Zoom Window 
Zoom buttons allow you to zoom in / out the current view, in variable steps (from 10% to 1000%) Custom Zoom is supported.
Zoom Window
Zoom Window - You can select an area to be zoomed using the mouse to draw a rectangular window simultaneously holding right mouse button. This window will be zoomed automatically on release of mouse. To restore previous graph click Range Button (in settings box) select - Auto Range.

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