How to capture minimum spacing?

I need to find the absolute minimum spacing defined in the Constraint Manager. This includes the CSets and any number manually entered in the CM, Region rules, Class/Class, etc. 

I see the function axlCNSGetSpacing will retrieve the values of your various CSets, but smaller numbers can be manually entered (i.e. not defined by a CSet) or set manually under region or class/class rules. Is there a way to derive this rock-bottom spacing value?

I tried to get that info via axlCnsTableSeek, but it doesn't seem to work period. 

Thanks in advance,

Douglas Stanley