I am not convinced by the provenance history of the VMS

[oshfdk]

Here is my expert chart, which others have seen, perhaps, but I don't think you have. Totally and razor sharp on target to your point here, and to the subject and content of this thread:

Just in case, here's a version of your chart with a bit more conventional range visuals, if I understand them correctly. I think it makes the ranges a bit more obvious. If needed, you can use this version in any way you want.