fig = p1.figure
            ax = fig.gca(projection='3d')
            x, y, z = axes3d.get_test_data(0.05)
            ax.plot_surface(x, y, z, rstride=8, cstride=8, alpha=0.3)
            ax.contour(x, y, z, zdir='z', offset=-100)
            ax.contour(x, y, z, zdir='x', offset=-40)
            ax.contour(x, y, z, zdir='y', offset=40)

            ax.set_xlabel('X')
            ax.set_xlim(-40, 40)
            ax.set_ylabel('Y')
            ax.set_ylim(-40, 40)
            ax.set_zlabel('Z')
            ax.set_zlim(-100, 100)