Graphs of 3D-FD values versus Duration. (a) Lt-A-FD versus Duration, (b) Rt-A-FD versus Duration, (c) Lt-PU-FD versus Duration, (d) Rt-PU-FD versus Duration, (e) Lt-PL-FD versus Duration, (f) Rt-PL-FD versus Duration, (g) V-FD versus Duration, and (h) Cb-FD versus Duration. Stars represent the subgroup with CAG < 74, and circles represent the subgroup with CAG ≥ 74. The dash lines represent the common slopes of the SCA3 subgroups. Lt-A-FD: left anterior lobe FD, Rt-A-FD: right anterior lobe FD, Lt-PU-FD: left posterior upper lobe FD, Rt-PU-FD: right posterior upper lobe FD, Lt-PL-FD: left posterior lobe FD, Rt-PL-FD: right posterior lobe FD, V-FD: vermis FD, Cb-FD: FD of the whole cerebellum.