C57BL6_mouse folder: The corresponding atlas folder from DSI Studio. This folder can also be found in the root directory where DSI Studio is installed.
C57BL6_mouse_iso.nii.gz: This is the iso NIFTI file created by loading the fib file from the C57BL6_mouse folder and saving the iso part of it as a NIFTI file. This file is equivalent to the C57BL6_mouse.ISO.nii.gz file in the C57BL6_mouse folder, which has a higher resolution. However, since the masks were drawn using the C57BL6_mouse.fib.gz file, this was saved separately.