When one isn't enough.

When comparing multiple measures it's sometimes helpful to make use of subplots. These create new axes onto which marks can be mapped.

In order to change the subplot a given mark is on, click on the ellipsis next to the mark type to bring up the mark controls:

The number of subplots in the visual will change to as necessary accommodate all marks.

Butterfly chart

In the following example of a butterfly chart, we use two x-axes to show two different metrics. These x-axes share the same y-axis.

Scatter matrix

Another way to use subplots is to make a grid of charts, as in a correlation or scatter matrix:

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