I have generated simulated data (voxel time series) in the form of a 2D matrix ( N voxels x T timepoints). I would like to save it in a 3D+time dataset, for example a dataset with one slice (nx=ny and nz=1) and nt=T timepoints, in order to visualize it in AFNI. I've looked at 3dEmpty, but I am not sure whether it is the best option. Any suggestion?