updated to write 4-d volumes (e.g. deformation vector fields)
updated to write 4-d volumes (e.g. deformation vector fields)

aditiiyer/CERR,cerr/CERR,aditiiyer/CERR,aditiiyer/CERR,cerr/CERR,aditiiyer/CERR,aditiiyer/CERR,cerr/CERR,cerr/CERR,cerr/CERR,cerr/CERR,aditiiyer/CERR,cerr/CERR,cerr/CERR,cerr/CERR,aditiiyer/CERR,aditiiyer/CERR