I found the DFC file format page and finally understood that the dft file is also this format. I’ve written a Python class to read the curves and now I want to double check: are the coordinates of the tracks in the T1 coordinate system? Or, do I have to apply a diffusion to T1 transform?
In case it is useful for others, I post the short dfc reader I wrote here:
https://gist.github.com/maedoc/c02e3aafbfe8843cc479