How do I define Limits of Colors in a Colorbar?

Hi, I'm actually doing a 3D surface plot where I have N and Q as inputs and Re as my output. I wish to represent my output Re using 2 colors in my colorbar, as the following: 0 to 2400 - Green and >2400 - Red. How can I do that?

Answer 1

[Walter Roberson]

surf(N, Q, Re, double(Re>2400));
colormap([0 0 1; 1 0 0]);

[Olivier Gouveia]

Thank you very much, It worked perfectly!