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We have measured the optical conductivity spectra σ(ω) of YbB 12 and YbAl 3 , which are typical mixed-valent Yb compounds. The measured σ(ω) spectra in the mid-infrared region are quite similar for the two compounds, with a pronounced peak centered near 0.2eV. This result demonstrates that the Kondo semiconductor YbB 12 and the highly metallic YbAl 3 share...