Drawing X & Y axis line on Scatter Chart where cross at: 0

I have a problem with a scatter graph.

The x values range from -80 to +40
The y vaules range from -6000 to +9000
Both need the axis to cross at 0

No gridlines are required on the graph apart from the main axis'. Which is where I'm struggling. The axis lines aren't drawn for the main axis points. However if I try to use 'gridlines' I end up with lines in other parts of the graph too, which is undesired.

How can I get the axis' to have their line drawn?

Thanks,
David (HN)

Did you try setting the axis major interval to a very large value (e.g. 10000)?

-- Robert