probtrackx2 -l -c 0 -S 2000 --steplength=0.5 -P 5000 -V 0 --os2t --s2tastext --fibthresh=0.01 --distthresh=0.0 --sampvox=0.0 --forcedir --opd --ompl -s /projroot/hcp/rec/100206/bedpostx/merged -m /projroot/hcp/rec/100206/bedpostx/nodif_brain_mask -x /projroot/hcp/rec/100206/label/HCP/lh.L_V1_ROI.nii --targetmasks=/projroot/hcp/rec/100206/HCP_seeds.txt --xfm=/projroot/hcp/rec/100206/xfms/fs2fa.mat --seedref=/projroot/hcp/rec/100206/anat/fs.nii.gz --dir=/projroot/hcp/rec/100206/probtrackx_s2t/S001/