A heatmap chart is a type of visualization that shows the intensity of a variable using colors. A XY heatmap chart is a heatmap chart that uses two numeric variables as the axes and a third numeric or categorical variable as the color dimension.

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To create a XY heatmap chart in Tableau, follow these steps:

1. Connect to your data source and drag the two numeric variables you want to use as the axes to the Columns and Rows shelves. For example, if you want to create a heatmap of sales by product category and region, drag Product Category to Columns and Region to Rows.
2. Drag the third variable you want to use as the color dimension to the Color mark. For example, drag Sales to Color.
3. Change the mark type from Automatic to Square. This will create a grid of squares with different colors based on the values of the third variable.
4. Adjust the size of the squares by dragging the Size slider or entering a value in the Size field.
5. Optionally, you can add labels, tooltips, filters, legends, titles, and other formatting options to enhance your visualization.

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