Thank you for nice reply!

I have one more question.

I drew a minip tractography.

I made a netrois file, which is made with two roi files.

However, when I view the output grid file, it contains the following:

leetaeyui-Mac-Pro:1001 leetaey$ cat tract.r.tha-ofc_000.grid
# 2 # Number of network ROIs
# 17 # Number of grid matrices
# WITH_ROI_LABELS
001 002
1 2
# NT
81025 14
14 43144
# fNT
2.252820e-02 3.892562e-06
3.892562e-06 1.199576e-02
# PV
6.469600e+04 4.720000e+02
4.720000e+02 5.662400e+04
# fNV
4.894123e-02 3.570586e-04
3.570586e-04 4.283492e-02
# NV
8.087000e+03 5.900000e+01
5.900000e+01 7.078000e+03
# FA
4.130704e-01 4.096045e-01
4.096045e-01 3.369234e-01
# sFA
2.173442e-01 1.437584e-01
1.437584e-01 1.910252e-01
# MD
1.264891e+00 8.826535e-01
8.826535e-01 1.066070e+00
# sMD
9.137838e+00 5.143825e-01
5.143825e-01 2.927470e+00
# L1
2.005381e+00 1.234964e+00
1.234964e+00 1.608433e+00
# sL1
2.713691e+01 5.488138e-01
5.488138e-01 8.388085e+00
# RD
8.946502e-01 7.064979e-01
7.064979e-01 7.948889e-01
# sRD
8.299646e-01 5.043321e-01
5.043321e-01 5.369039e-01
# L2
9.988644e-01 8.240543e-01
8.240543e-01 9.162866e-01
# sL2
8.482569e-01 5.384176e-01
5.384176e-01 7.662724e-01
# L3
7.103091e-01 5.889417e-01
5.889417e-01 6.633191e-01
# sL3
6.760154e-01 4.753560e-01
4.753560e-01 3.906177e-01


I know the results contains mean and standard deviation.

However, it has two means and two standard deviations.

How can I deal with this?

And, is it correct values in FA? they seem too high..