Peter Cherry

[vsite_example.tar.gz](https://github.com/openforcefield/openff-toolkit/files/11563598/vsite_example.tar.gz) Very sorry about that, the script should be attached. Sorry, it's tarred up because I don't seem to be able to attach just a .py script. Many Thanks.

Hi. Thanks very much for this detailed response. I think I understand it, but was actually on study leave today and won't be back work until Tuesday, so will go...