Chart line thickness (line width)

It is possible to make the lines thicker in a standard splunk line chart? I found the "charting.lineWidth" option in the Chart Configuration Reference at [http://docs.splunk.com/Documentation/Splunk/latest/Viz/ChartConfigurationReference][1]. However, when I add that to my XML, as such: `3` Then I get the following: Warning on line 194: Unknown option name="charting.lineWidth" for node="chart" Thanks in advance for your help. [1]: http://docs.splunk.com/Documentation/Splunk/latest/Viz/ChartConfigurationReference