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If you wish to take a closer look at a certain part of your measurement you can use the “Zoom” function. The Autoscale “Height”, “Width” and “Both” buttons makes it easy to zoom fully out in the corresponding direction.
You can also zoom with a “rubber band” motion and fixed origin simply by dragging the X- and Y-axis. Holding down Shift while doing the same fixes the upper value and lets the origin vary. Holding down Ctrl and dragging the X- or Y-axis will move the entire scale up/down or side to side. There’s also the possibility to zoom by marking an area in the graph with the mouse and click on it.