Node (dot) in the middle of element (TCL?)

Hello everyone!

I have 3D tetra mesh and in the middle of any particular element of the mesh I have a dot.
It seems that this dot means nothing, couldn't find any information about it.

But for my project I need to get coordinates of those dots, without coordinates of the mesh.

As an example we can get .txt file with coordinates of elements of the mesh.
What I need to get is the same .txt file with coordinates but with coordinates of those dots only.

Should I use some TCL commands or is there any way to do that?

Very grateful for any help!

<?xml version="1.0" encoding="UTF-8"?>