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A location with lots of void space was chosen for better readability. 20.4 a (if variable densities were employed, the R i would be larger, resulting in substantial overlap, even in this region of few particles).
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20.4 b, which is a small portion of the CDS representation of the 2D field given in Fig. Therefore, this model cannot recover a continuous density medium as shown in Fig. Some locations may be influenced by more than one particle, while some other locations may not be in the influence region of any particle, i.e., there is a void in these places. The overall density at an arbitrary position is the sum of density contributions from all nearby particles. Termed the Constant Density Sphere (CDS) model.
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