Can we make isoglosses?

[Koen G]

What you want to describe is Upper German.
What can be seen in the VM goes linguistically to the east. "Bavarian

Well yes, that is what I would like to get some more clarity about. Are gas and mich even regionally compatible? Would this be compatible with "pox leber"? We will be stuck in an endless exchange of proclamations like these, unless we gather some data to back things up.

Michelle: yeah, mich is a big problem, and I don't think this investigation will be easy. That is why I bring it up first before going on a wild gas chase

One possible strategy would be to focus on cook books and skim the uses of "mich" in those.

Another strategy is if we'd find similar words. A change like geis -> gas is rarely limited to a single word, and other words can be expected to have undergone the same sound shift. The shift from "milch" to "mich" sounds so unusual to me, however, that I can't even think of a parallel case. It would presuppose other words ending in "ilch".