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The Heatmap element shows the counts or average values for groups of observations using a color intensity scale. If you plot a single variable as either Y or X, your plot appears as bars. If you plot a cross tabulation of two variables Y and X, your plot shows rectangles.
Figure 3.35 Heatmap Options
Tip: If you have multiple graphs, you can color or size each graph by different variables. Drag a second variable to the Color or Size zone, and drop it in a corner. In the Variables option, select the specific color or size variable to apply to each graph.

Help created on 3/19/2020