Hi Adrian Pay,
The "k" abbreviation after thousands appears due to Label formatting. RadChart also allows you to specify how to format the labels by specifying ChartArea.LabelFormatBehavior
. This is described in our help topic - http://www.telerik.com/help/silverlight/radchart-features-chart-area.html
By default LabelFormatBehaviour is set to HumanReadable and you should change it to None
Hope this helps.
the Telerik team
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