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The pronounced /-0 selectivity of the (e y e'p) proton knockout reaction has been exploited to determine the relative occupation of the 3s 1/ 2 proton orbit in 205 T1 and 206 Pb. This value, when combined with previous electron scattering data, enables us to extract in a largely model-independent fashion the absolute 3s 1/ 2 occupation probability in 208 Pb. The depletion of the 3s 1/ 2 proton orbit is found to be (18 ± 9)%, compatible with predictions of many-body theories.