Contourf colorbar control :white and rainbow

I have following plot with contourf, I used command contourf(dd,Z,SS); SS in the matrix

I need SS<5 to be displayed in white and above 5 in rainbow palette.

SS(SS<=5) = NaN; gives scissorcut image much to my chagrin

Please help friends!

[Utsav]

I could find out the answer in the link

http://in.mathworks.com/matlabcentral/newsreader/view_thread/153361

reply by Alessandro Toso

[hC hC] = contourf(interp2(e_av,2,'spline'),[0.12:0.01:0.3]); > set(hC,'LineStyle','none'); > colorbar;