FIG. 4. Hypothetical diagram of the equilibrium distribution of water content and matric potentials in a 4-cm-tall sample of porous ceramic aggregate Turface subjected to (a) Earth's gravity, (b) 1.8 g, and (c) 0 g. The average matric potential (i.e., at the midpoint) is constant at –4 cm. The shaded area shows regions of validity for water content and potentials where the gravitational force scales the hydrostatic equilibrium distribution.