function to expand structure by a margin slice-by-slice.
function to expand structure by a margin slice-by-slice.

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