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    Under  X,  call  the  lens on the active window. The flow of commands is
    suspended until the lens is closed.

    The usual way to call the lens is using the middle-click of the mouse on
    the  plot. However, this command is useful to give a detailed look to an
    intermediate plot during a procedure, since it acts like a PAUSE.

    When opened, the lens is controled by the following actions:
      - Mouse wheel: reduce or enlarge the zooming factor,
      - Left-click or CTRL+wheel: reduce the lens area,
      - Right-click or CTRL+wheel: enlarge the lens area,
      - Middle-click: close the lens

Gildas manager 2014-07-01