(2) Zoom-in a part of spectrum
As Fig. 5.3, hold down the left button of mouse and drag the mouse pointer from
upper-left-end to lower-right-end of the area that is zoomed in.
Fig. 4.7-3 Zoom-in a part of spectrum
As Fig. 4.7-4, hold down the left button of mouse and drag the mouse pointer from
lower-right-end to upper-left-end of the area that was zoomed in.
Fig. 4.7-4 Zoom-out operation
Hold down the left button of mouse and drag the mouse pointer
from upper-left-end to lower-right-end of the area that is zoomed in.
Hold down the left button of mouse and drag the mouse pointer
from lower-right to upper-left of the area of chart.
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