Change all line thicknesses in scatter graph

Hi,

I have an XY scatter with 40 or so different lines displayed.

I want to change the thickness of all of the lines. I dont want to have to try and select them individually and change them. Is there any way to do this? Perhaps changing the default thickness of lines for this type of graph?

please help!

cheers

found a macro that does it! :-)
should have searched more diligently before posting!