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Click Tools > Options.
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On the Preferences tab, click the Viewer Options button.
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Go to the View tab of the Detail File Viewer dialog box.
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In the Magnification Factor list box, select the number of times you want to magnify the image you select with the Magnify Window Area command.
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You can select any number from one to ten.
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Numbers with decimals are rounded to the nearest whole number when you close this dialog box.