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Complex-frequency ω plot of the Casimir-force integrand (ln |ℜdFx/dω|), where dFx/dω is in units of ℏ/d2, for the geometry of Fig. 1. As the real-ω axis is approached, the integrand becomes highly oscillatory, which is only partially revealed here because of the finite frequency resolution. Various integration contours of interest are labeled as black and dashed lines. (Inset): Vacuum ε = 1 contour deformations ω(ξ) and their corresponding (real frequency) physical realizations εc(ξ).
