HP 39gs Graphing manual To box zoom

Y-Zoom In:

Y-Zoom In

Now un-zoom.

Y-Zoom Out:

Y-Zoom Out

Zoom Square:

Square

To box zoom	The Box Zoom option lets you draw a box around the
	area you want to zoom in on by selecting the endpoints
	of one diagonal of the zoom rectangle.
	1.	If necessary, press			to turn on the menu-key
		labels.
	2.	Press		and select Box...
	3.	Position the cursor on one corner of the rectangle.
		Press		.
	4.	Use the cursor keys
		(	, etc.) to drag to
		the opposite corner.
	5.	Press		to zoom in
		on the boxed area.

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