If you display multiple x variables or multiple y variables on the same graph, then you can add a secondary scale. For example, on the original scatterplot below, the x variables (Height and Weight) share the same x-scale. The variables have different ranges, which makes the data values for Height difficult to interpret. If you assign one variable to a secondary scale with its own range, then the data values for each variable are easier to read.
Original x-axis
x-axis with secondary scale

To add a secondary scale for one or more variables, double-click the scale and click the Secondary tab.

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