All plots use default autoscaling to format data. You can change these default views using the auto attribute inside a dim tag inside your plot.

  <axis dim="x" auto="fixed" min="0" max="15" />
     <data>0 0; 10 10; 20 15</data>

When the x-axis auto parameter is set to fixed, the x-axis range will always be set to 0-15 even though there is data outside that range.

The autoscaling modes that are available are: