Dear @sachac (BTW, are you the legendary Sacha Chua?)

There was a parenthesis missing in the end, but it is working!!! :)))

I still have to understand the scope (does it works on the heading/ tree where it is called only, can I "point it" to a specific table, etc.) but it is a really great step forward.

And, as I wanted, it is short, simple, elegant, works perfectly and -specially- shows the power of elisp and how literate programming can be useful and powerful for reproducible research (this is part of my thesis).

I may continue with some questions, but it helps me a lot to learn.

Thank you so much! :D