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Figure 8. (A) Plot of mercury saturation versus mercury saturation divided by pressure, showing an apex at a saturation of 28%. (B) Semilog plot of pore aperture radii versus cumulative mercury saturation. The corresponding histogram (log[2] classes) has a modal pore aperture class between 1.41 and 1.0 micrometers and a weak secondary modal class from 0.125 to 0.088 micrometer. The coarser mode corresponds to the apex, which is where the pores occur that are capable of dominating flow; Terry Sandstone, 16.4% porosity and 1.8 md permeability.