Zoom View  
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You can closely examine a small section of the graph by zooming in on the graph. Place your mouse pointer in the upper left corner of the area you want to enlarge, then holding the left button down, drag the mouse to the lower right of the zoom area and release the button. The outlined area will be enlarged or zoomed to fill the entire chart area.  
 
Notice that the relative scales are adjusted to that the rectangular area outlined for sooming is stretched if needed along the horizontal and vertical axes to fit the area to the full size of the plot view area.  
 
To return to normal view, hold the mouse button down and drag toward the upper left and release. View will be returned to normal viewing.