total_rows = uint32(size(F215,1))
for m = 1:2
    for n = 1:total_rows
        if  F215(n,m) < 0
            F215norm(n,m) = 0;
         elseif F215(n,m) < 1
                F215norm(n,m) = 1;      
        elseif  F215(n,m) < 2
            F215norm(n,m) = 2;
         else
            F215norm(n,m) = 3;
        end
    end
end