SpiderChart Issue

Hello tms team,
I would like to customize a spider chart series so that the center of the chart could be a negative value. How can I do that? The result should have a zero line looking like this:
________________________________
6   4   2   0   -2   -4   -6   -4   -2   0   2   4   6

This way, every circle has the same value as I expected it from a circular chart.

Hi, 


Unfortunately this is currently not supported as the spider / pie / donut charts are all based on one system that only support positive values. We have added this on our feature request list for implementation.

Regards, 
Scheldeman Pieter