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## Changing the opacity variable

The variable used to determine opacity does not have to be the plotted variable. Having a different opacity variable than the plotted variable is useful for instances in which you want to determine the opacity using a variable like density while coloring the plot by another variable such as pressure. To change the opacity variable, select a new variable from the Opacity variable variable menu. By default, the plotted variable is used as the opacity variable. This is implied when the Opacity variable variable button contains the word default. Even when "default" is chosen, it is possible to set artificial data limits on the opacity variable by entering new values into the Min or Max text fields.