Multiple Series, Same Marker

Greetings,

Using Excel 2007, I have a multiple series graph (common x-axis, different y-axis values). In total, when charted, it comes in as 57 different series items; each with their own distinct marker style. I'd like every single point to have the same maker style (open circle, black...no connecting lines). I'm sure there is a simple VBA code for this...can anyone help?

Thanks, Robert.