Revision 3: the responses from the 3-pass eroded mask, WM by Tournier 2013 (dmipy-fit 11294e9); fractions no longer inflated in white matter

revision 2: the FOD field and fractions by csd_msmt_torch (dmipy-fit 7f25074, exact to 1e-13; the cvxpy/OSQP fit left negative lobes)

MASiVar sub-cIs1: the MT-CSD FOD field, fractions, mask, parcellation (dmipy-fit f6741c370fbf)