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Dependence of Δμ in prodan (empty squares) and C135 (full squares) on νvac−ν0. Extrapolation of the fits to νvac yields the vacuum dipole moment changes, Δμvac=12.8±0.6 D for prodan (dashed line) and Δμvac=9.4±0.5 D for C153 (solid line). The slopes of the fits then give the values for change in polarizability, Δα=46.8±4.7 Å3 (prodan) and Δα=−6.6±0.7 Å3 (C153).
