FIGURE 10. Contour lines of the tangent-sphere η, ξ coordinates, plotted in the y = 0 (φ = 0) Cartesian plane. η = 0 lies on the z-axis, η → ∞ at the contact point. The horizontal wall lies on the ξ = 0 isosurface, while the bubble surface is always mapped by ξ = 1. The separation of the plotted contours is uniform (1η=1ξ = 0.1).
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