Hello Todd,
I am sorry to say that currently the RadHtmlChart does not offer this functionality and the lines width is predefined. The situation here is much more complex because we do not have all the .NET utilities for working with images on the server, but instead everything is done via JavaScript on the client. Nevertheless, I am logging the feature request in the PITS and you can monitor the item's popularity in
this URL.
Kind regards,
Marin Bratanov
the Telerik team
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