Ingo, I did notice when trying out your code just now that in your files you
use:

#version 3.7;

But when I rendered with the v3.7 executable it choked, which confused me for a
moment until I realized you're using the new v3.8 keyword tau.

It renders as expected with the v3.8 executable so to prevent confusion you
might want to change that to:

#version 3.8;

Again, excellent work!

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