Spider Charts and Gruff: THE JOY OF GRAPHING

I hope this day finds you well.

I need to generate Spider charts (aka radar charts) , and am using Gruff
to do so.

How can I show lines and axis numbers on a Spider chart? Here's what
I'm trying to make:

http://img.skitch.com/20080925-m573hhdy4n4x6i92s17knjqjeg.jpg

How can I have those 0 - 100 numbers, and the concentric cirles in the
graph?

Joe

The more I look at this, the more it seems that I can't put concentric
circles or the numbers. Am I wrong about this?

Also, is there any way to add "bottom-margin" to a spider graph in
Gruff? It doesn't look that way so far...