warp2metric fod_warp.mif -jdet - | testing_diff_image - warp2metric/jdet.mif -frac 0.001
warp2metric fod_warp.mif -jmat - | testing_diff_image - warp2metric/jmat.mif -frac 0.001
warp2metric fod_warp.mif -fc fixel_image tmp fc.mif -force && testing_diff_fixel tmp warp2metric/fc -frac 0.001
