[NTG-context] about character expansion

Dear list, I would like to introduce character expansion to novice users. I know that ConTeXt adds values automatically. But I’m interested in showing extremely stretched and shrinked characters, as an example of character expansion done wrong. Sorry for not providing a minimal example, but I don’t have any idea about how to achieve that. Does anyone know how to do it? Many thanks for your help, Pablo -- http://www.ousia.tk