Util::zoom()

zoom( [name => "gqe_name"] [, cb_func => \&some_function])
Zooms the spefified GQE or all active GQEs. If supplied, the callback function is called after each display of the data. That happens, after the user pressed a button to zoom-in/zoom-out or to move the window left/right. The callback function is intended to be used to display some text on the screen. The current zoom window limits can be found at $Spectra::SYM{ zoom_x_min} and $Spectra::SYM{ zoom_x_max}.
e.g.:
Util::zoom( name => "scan_c1");