computing {TAIL ~ an RMS current density estimate} for {HEAD ~ each voxel} from the covariance matrix and the forward solution for that voxel; and 
computing { TAIL ~ an RMS current density estimate } for { HEAD ~ each voxel } from the covariance matrix and the forward solution for that voxel ; and
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH