I'm trying to graph a contour map of this function: e^(y/x)

>with(plots)

>contourplot(e^(y/x),x=-3..3,y=-0.5..0.5)

I thought the contour map for this function would looks more like several lines intersects at the origin. But when I graph it on Maple, it doesn't looks like the graph I'm looking for.

Did I put in a wrong range?

how to graph this two paraboloids into one graph in Maple? z=x^2+y^2 and z=2-x^2-y^2  I try to use Display, Display3d commend, and it doesn't work.

>with(plots)

>f:=(x,y,z)->z=x^2+y^2;

>implicitplot3d(f(x,y,z),x=-5..5,y=-5..5,z=-5..5);

>f:=(x,y,z)->z=2-x^2-y^2;

>impliticitplot3d(f(x,y,z),x=-5..5,y=-5..5,z=-5..5);

and if I want to combine the two graph into one, what should I do next?