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Plot3D and ContourPlot problem


Hi,
i want to combine Plot3D and ContourPlot. Do You have any idea how to do
that?
I need to have for example picture with plotted function f[x,y] and on the
x-y plane shown its contours

f[x_, y_] := Exp[-(x^2 + y^2)]

a = Plot3D[f[x, y], {x, -2, 2}, {y, -2, 2}, HiddenSurface ->
    False, Shading -> False, Boxed -> True, PlotPoints -> 15]
b = ContourPlot[f[x, y], {x, -2, 2}, {y, -2, 2}, PlotPoints -> 30]

Any ideas how to do something like "Show[a,b]"?

Thanks,
Josef


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