exhibit2: specify a custom color for a gradient size circle?

[Jakob Fix]

Hi,

I've searched in the wiki and in the source code, but couldn't find any information on this:

Take the map view of the billionaires example (http://www.simile-widgets.org/exhibit/examples/billionaires/billionaires.html). 

All the circles are colored in orange.

How and where can I change this color in Exhibit 2?

Thanks,

Jakob.

PS: http://www.simile-widgets.org/wiki/Exhibit/Coders doesn't provide this information.