How do I create contour plot of a given matrix?

% out is 20X20 matrix containing values given in v vector
Range1=linspace(1,7,20);

Range2=linspace(1,4,20);
[R1,R2] = meshgrid(Range1,Range2);
 T=transpose(out);
 v=[-33,21,29,34,40,45];
 Nc=length(v);
 for ii=1:Nc
     M=contour(R1,R2,T,[v(ii) v(ii)],'k');    
hold on

end

I am not sure why I am getting such kind of figure I would like to have seperate regions in figure.