Hello Ulrich,
In order to make sure that the line properly spanls on the available width, you need to introduce more XAxis values. In this manner, the values will fall into, say 10 categories, instead of only two, and will be more evenly distributed. Other than this, the control strictly adheres to the correspondence between the data and the categories.
I hope this information helps.
Greetings,
Yavor
the Telerik team
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