Hi Fanny - The meaning of the statistics is explained in this section of the TRACULA tutorial:

https://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/TraculaStatistics#Anisotropyanddiffusivityaveragedatcross-sectionsalongapathway

Please note that the instructions in the tutorial have now been updated to reflect the upcoming 7.2 version (but the meaning of the numbers in the stats files is the same for 7.1.1 and older versions).

Best,

Anastasia.

From: freesurfer-bounces@nmr.mgh.harvard.edu <freesurfer-bounces@nmr.mgh.harvard.edu> on behalf of Fanny Noury <fanny.noury@univ-rennes1.fr>
Sent: Friday, July 9, 2021 4:29 AM
To: freesurfer@nmr.mgh.harvard.edu <freesurfer@nmr.mgh.harvard.edu>
Subject: [Freesurfer] Tracula 7.1.1 - trac-all - stat

        External Email - Use Caution        

Hello FreeSurfer Developers,

I am just started to use "the trac-all -stat" command of Tracula 7.1.1 to reconstruct a mean tract for each pathway for all the subjects of a 
group. Several files are created for each pathway in the "stat" directory.

What are the differences between these two files created for the AF, MD 
AD and RD diffusion parameters :

- TRACTNAME_PP.avg33_mni_bbr.**.txt

- TRACTNAME_PP.avg33_mni_bbr.**_Avg.txt


Thank You very much for your help.


Best Regards,
F. Noury

-----------------------------------------
Fanny NOURY, Ph.D
Associate Pr.
Rennes 1 University

LTSI UMR INSERM 1099
Université de Rennes 1
Campus Villejean - RDC Bât. 5
CS 34317
35043 Rennes Cedex
France