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Click the Replace Expression button to select a predefined quantity and replace the contents of the Expression field with the corresponding variable.
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Click the Insert Expression button to insert the corresponding variable at the current position in the Expression field.
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Select a Table and plot unit from the list. You can select from a predefined number of applicable units for the quantity that the variable represents, but you can also click in the unit’s text field and type any compatible unit for that quantity to use a unit that is not in the list (for example, mi/h for miles per hour as a unit for a velocity quantity).
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Select the Description check box to enter a description (or edit the default).
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