Data Analysis in COMSOL

Hi all,

I am simulating an electromagnet, but my question can be extended to any other problem.
Is I want to know the field average, the max and min value along a cenrtain axis I can define a cutline and use the Average, Maximum and Minimum operation in the Derived value node.

Now what I want to do is to evaluate the expression "(Max-Min)/ave" but I can't figure out how to do it.
Could you please give me some advice?

Thanks
Francesco