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# Merging types overview

This topic describes the three types of merging graphs: Overlay, Tile, and Correlate. For details, see the Merge Graphs dialog box.

In this topic:

## Overlay

You can superimpose the contents of two graphs that share a common x- axis. The left y-axis on the merged graph shows the current graph's values. The right y-axis shows the values of the graph that was merged. There is no limit to the number of graphs that you can overlay. When you overlay two graphs, the y-axis for each graph is displayed separately to the right and left of the graph. When you overlay more than two graphs, a single y-axis is shown, scaling the different measurements accordingly.

In the following example, the Average Transaction Response Time and Running Vusers graphs are overlaid with one another.

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## Tile

You can view contents of two graphs that share a common x-axis in a tiled layout, one above the other. In the following example, the Average Transaction Response Time and Running Vusers graphs are tiled one above the other.

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## Correlate

Use the Correlate option to plot the y-axis of two graphs against each other. The active graph's y-axis becomes the x-axis of the merged graph. The y-axis of the graph that was merged, becomes the merged graph's y-axis.

In the following example, the Average Transaction Response Time and Running Vusers graphs are correlated with one another. The x-axis displays the Elapsed scenario time and the y-axis shows the average response time.

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