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        [GTVL\]ZOOM [X1 X2 Y1 Y2 | OFF]

    The  command  ZOOM opens or closes a new window which displays a smaller
    region of the current plot. Each plot can have its own  zooming  window.
    It will be reused by subsequent calls to the command ZOOM.

    Without  arguments,  ZOOM  calls  the cursor to define the viewing area.
    This area will be defined by its center (at the cursor position)  and  a
    zooming factor (by steps of 1.414):
       Z       Increase the zooming factor
       -       Decrease it
       0       Reset it
       E       Exits from the routine
    These  commands do not produce effective zooming, press the space bar to
    do it. For graphical displays, you may use the  mouse  buttons  for  the
    commands  <Space>  (left  mouse  button), Z (middle mouse button), and E
    (right mouse button).

    ZOOM X1 X2 Y1 Y2 can be used to define the viewing area by a  non-inter-
    active mean. The values must be in paper units (cm).

    Use ZOOM OFF to close the zoom window of the current plot, if any.

Gildas manager 2020-12-02