> plot3d(10*exp(-x^2-x*y/2-y^2/2)*sin(x)*sin(y), x=-2..2,y=-2..2, style=patchcontour, axes=boxed);

> plot3d(10*exp(-x^2-x*y/2-y^2/2)*sin(x)*sin(y), x=-2..2,y=-2..2, style=patchcontour, axes=boxed, orientation=[-90,0]);

>

>

>

> plot3d(exp(-x^2-y^2), x=-2..2,y=-2..2, style=patchcontour, axes=boxed);

>

> plot3d(exp(-x^2-y^2), x=-2..2,y=-2..2, style=patchcontour, axes=boxed, orientation=[-90,0]);

>