Proper scaling of values in spider chart

[joliebig]

I'm playing around with a car example for which non-functional properties have quite different values, e.g., costs [18000-45000] and performance [60-110].

The axes of the spider chart seem to have all the same scale, which does not work nicely when ranges differ that much. The three selected variants seem to be on a single line only; probably only caused by scaling issues.