HCP-YA842 is a tractography atlas which uses FSL’s FA map as its reference space, which averages from 58 FA images in the MNI152 coordinate.
In R, fascicles are stored as an object of class maf_df which
inherits from tbl_df, tbl and data.frame and stores, in each row,
information about a single 3D point. At a bare minimum, 5 variables are
stored for each point:
X, Y, Z: 3D coordinates of the current point;
PointId: Identification number of the current point among all points of
the streamline it belongs to;
StreamlineId: Identification number of the streamline which the current
point belongs to.
Yeh FC, Panesar S, Fernandes D, Meola A, Yoshino M, Fernandez-Miranda JC, Vettel JM, Verstynen T. Population-averaged atlas of the macroscale human structural connectome and its network topology. Neuroimage. 2018 Sep 1;178:57-68. (original data)