What is the dynamic range of the AFR sweeps across stoichiometric?

["mike mager" <mikemager@hotmail.com>]

Greetings!

The subject line says it all (if it wasn't truncated!):

"What is the dynamic range of the AFR sweeps across stoichiometric?"

I have never ran across any information as to just how far the AFR is swept. 
  I know (at least _something_) about the 'switching' nature of the  EGO, 
and about the need for varying inputs to the cataclysmic perverter.

Thanks,
Mike