Read `FreeSurfer` m3z file
read_fs_m3z(filename)registration data
file location, usually located at `mri/transforms/talairach.m3z`
An `m3z` file is a `gzip` binary file containing a dense vector field that describes a 3D registration between two volumes/images. This implementation follows the `Matlab` implementation from the `FreeSurfer`. This function is released under the `FreeSurfer` license: https://surfer.nmr.mgh.harvard.edu/fswiki/FreeSurferSoftwareLicense.