Vanguard LTCA-10, LTCA-40, WRM-10P, WRM-40 - Manual (Page 43)

REV 3 LTCA VERSION 2.xx SOFTWARE MANUAL
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Undo Zoom
This option is only available when viewing an expansion graph. When viewing an expansion
graph, selecting this option will zoom out of the expansion and display all data points.
Maximize...
This option will display the graph in a maximized window (full-screen).