[Freesurfer] Next brain atlas on ex vivo MRI

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Dear FreeSurfer developers,

I am trying to run the command

mri_histo_atlas_segment_fireants INPUT_SCAN OUTPUT_DIRECTORY GPU THREADS MODE SIDE

from NexBrain atlas on my ex vivo left hemisphere scan called EX_VIVO_18. I therefore use the following command : mri_histo_atlas_segment_fireants T2.nii EX_VIVO_18 1 -1 hemi left

And I get this answer back : "Incorrect number of arguments. Usage:

mri_histo_atlas_segment_fireants INPUT_SCAN OUTPUT_DIRECTORY GPU THREADS [BF_MODE]

Or, for help

mri_histo_atlas_segment_fireants --help" which corresponds to the SynthMorph version, which is designed for in vivo MRI.

I therefore do not know how to run the "real" ex vivo MRI command.

Thanks in advance,

Yasmine