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We have measured the short-range attractive force between crystalline Geplates, and found contributions from both the Casimir force and an electricalforce possibly generated by surface patch potentials. Using a model of surfacepatch effects that generates an additional force due to a distance dependenceof the apparent contact potential, the electrical force was parameterized usingdata at distances where the Casimir force is relatively small. Extrapolatingthis model, to provide a correction to the measured force at distances lessthan 5 $\mu$m, shows a residual force that is in agreement, within experimentaluncertainty, with five models that have been used to calculate the Casimirforce.

Measurement of the short-range attractive force between Ge plates using a torsion balance