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Figure Captions

Fig.1. Two rods between two infinite parallel plates.

Fig.2. The dimensionless functions , allowing the determination of the depletion potential to third order in density for arbitrary parameters.

Fig.3(a-d). Plots of typical depletion force in units of . The plots a-d correspond to reduced densities respectively. Lines: 2nd order perturbation results. Dashed lines: 3rd order perturbation results. Dots: numerical solutions of the full integral equation.

Fig.4(a-d). Plots of typical depletion potential in units of , for R/L=10, L/D=20. The plots a-d correspond to reduced densities respectively. Lines: 2nd order perturbation results. Dashed lines: 3rd order perturbation results. Dots: numerical solutions of the full integral equation.