Each " , " divides your value by 1000 and {# , , mil} will add "mil" sign at the end of your Y-Axis labels.
You should also know that label formatting is exclusive with the human readable digits, so before doing the above approach, set the ChartArea.LabelFormatBehavior to None.
Hope that helps.
Greetings,
Peshito
the Telerik team
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