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Select two Y columns of values (or a range from two columns). If there is an X column to the left of the Y columns, the X column values are used; otherwise, the worksheet's default X values are used.
Select required data.
From the menu, select .
or
Click the Fill Area button on the 2D Graphs toolbar.

FILLAREA.OTP (installed to the Origin program folder).
The area between the data plots (the two Y columns) is filled.