Make markers hollow circles without the seeing the line behind?

[Tom Krones]

Hey Guys,

I'm trying to style the markers on my chart, I want circles with hollow centers.  I can almost get what I want by using the circle marker but the centers are transparent so you can see the line behind the marker.  Is there any way to make the center of the circles the same color as the background of the chart so they look hollow?

Thanks,

Tom