How to plot 2d colormap

Hi, I’m a novice to ROOT and I want to know how to visualize 2d array. I used
TGraph2D *dt = new TGraph2D();…
unnamed.pdf (198 KB)
But I only want colormap (without the 3d frame). How can I get rid of the 3d grids and plot only 2d colormap (like the following)?unnamed.pdf (188 KB)


More specifically the COL option: … .html#HP14