It may be helpful to Analyze this code:
Z = 5+abs(peaks)/10;
[C,h] = contour(interp2(Z,4));
th = clabel(C,h);
set(th,'BackgroundColor',[1 1 .6],...
'Edgecolor',[.7 .7 .7])
for k=1:length(th)
tmp = get(th(k),'String');
tmp = strrep(tmp,'.',':');
set(th(k),'String',tmp)
end
